source3/smbd/posix_acls.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    SMB NT Security Descriptor / Unix permission conversion.
   4    Copyright (C) Jeremy Allison 1994-2009.
   5    Copyright (C) Andreas Gruenbacher 2002.
   6    Copyright (C) Simo Sorce <idra@samba.org> 2009.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23
  24 extern struct current_user current_user;
  25 extern const struct generic_mapping file_generic_mapping;
  26
  27 #undef  DBGC_CLASS
  28 #define DBGC_CLASS DBGC_ACLS
  29
  30 /****************************************************************************
  31  Data structures representing the internal ACE format.
  32 ****************************************************************************/
  33
  34 enum ace_owner {UID_ACE, GID_ACE, WORLD_ACE};
  35 enum ace_attribute {ALLOW_ACE, DENY_ACE}; /* Used for incoming NT ACLS. */
  36
  37 typedef union posix_id {
  38                 uid_t uid;
  39                 gid_t gid;
  40                 int world;
  41 } posix_id;
  42
  43 typedef struct canon_ace {
  44         struct canon_ace *next, *prev;
  45         SMB_ACL_TAG_T type;
  46         mode_t perms; /* Only use S_I(R|W|X)USR mode bits here. */
  47         DOM_SID trustee;
  48         enum ace_owner owner_type;
  49         enum ace_attribute attr;
  50         posix_id unix_ug;
  51         uint8_t ace_flags; /* From windows ACE entry. */
  52 } canon_ace;
  53
  54 #define ALL_ACE_PERMS (S_IRUSR|S_IWUSR|S_IXUSR)
  55
  56 /*
  57  * EA format of user.SAMBA_PAI (Samba_Posix_Acl_Interitance)
  58  * attribute on disk - version 1.
  59  * All values are little endian.
  60  *
  61  * |  1   |  1   |   2         |         2           |  ....
  62  * +------+------+-------------+---------------------+-------------+--------------------+
  63  * | vers | flag | num_entries | num_default_entries | ..entries.. | default_entries... |
  64  * +------+------+-------------+---------------------+-------------+--------------------+
  65  *
  66  * Entry format is :
  67  *
  68  * |  1   |       4           |
  69  * +------+-------------------+
  70  * | value|  uid/gid or world |
  71  * | type |  value            |
  72  * +------+-------------------+
  73  *
  74  * Version 2 format. Stores extra Windows metadata about an ACL.
  75  *
  76  * |  1   |  2       |   2         |         2           |  ....
  77  * +------+----------+-------------+---------------------+-------------+--------------------+
  78  * | vers | ace      | num_entries | num_default_entries | ..entries.. | default_entries... |
  79  * |   2  |  type    |             |                     |             |                    |
  80  * +------+----------+-------------+---------------------+-------------+--------------------+
  81  *
  82  * Entry format is :
  83  *
  84  * |  1   |  1   |       4           |
  85  * +------+------+-------------------+
  86  * | ace  | value|  uid/gid or world |
  87  * | flag | type |  value            |
  88  * +------+-------------------+------+
  89  *
  90  */
  91
  92 #define PAI_VERSION_OFFSET                      0
  93
  94 #define PAI_V1_FLAG_OFFSET                      1
  95 #define PAI_V1_NUM_ENTRIES_OFFSET               2
  96 #define PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET       4
  97 #define PAI_V1_ENTRIES_BASE                     6
  98 #define PAI_V1_ACL_FLAG_PROTECTED               0x1
  99 #define PAI_V1_ENTRY_LENGTH                     5
 100
 101 #define PAI_V1_VERSION                          1
 102
 103 #define PAI_V2_TYPE_OFFSET                      1
 104 #define PAI_V2_NUM_ENTRIES_OFFSET               3
 105 #define PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET       5
 106 #define PAI_V2_ENTRIES_BASE                     7
 107 #define PAI_V2_ENTRY_LENGTH                     6
 108
 109 #define PAI_V2_VERSION                          2
 110
 111 /*
 112  * In memory format of user.SAMBA_PAI attribute.
 113  */
 114
 115 struct pai_entry {
 116         struct pai_entry *next, *prev;
 117         uint8_t ace_flags;
 118         enum ace_owner owner_type;
 119         posix_id unix_ug;
 120 };
 121
 122 struct pai_val {
 123         uint16_t sd_type;
 124         unsigned int num_entries;
 125         struct pai_entry *entry_list;
 126         unsigned int num_def_entries;
 127         struct pai_entry *def_entry_list;
 128 };
 129
 130 /************************************************************************
 131  Return a uint32 of the pai_entry principal.
 132 ************************************************************************/
 133
 134 static uint32_t get_pai_entry_val(struct pai_entry *paie)
 135 {
 136         switch (paie->owner_type) {
 137                 case UID_ACE:
 138                         DEBUG(10,("get_pai_entry_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
 139                         return (uint32_t)paie->unix_ug.uid;
 140                 case GID_ACE:
 141                         DEBUG(10,("get_pai_entry_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
 142                         return (uint32_t)paie->unix_ug.gid;
 143                 case WORLD_ACE:
 144                 default:
 145                         DEBUG(10,("get_pai_entry_val: world ace\n"));
 146                         return (uint32_t)-1;
 147         }
 148 }
 149
 150 /************************************************************************
 151  Return a uint32 of the entry principal.
 152 ************************************************************************/
 153
 154 static uint32_t get_entry_val(canon_ace *ace_entry)
 155 {
 156         switch (ace_entry->owner_type) {
 157                 case UID_ACE:
 158                         DEBUG(10,("get_entry_val: uid = %u\n", (unsigned int)ace_entry->unix_ug.uid ));
 159                         return (uint32_t)ace_entry->unix_ug.uid;
 160                 case GID_ACE:
 161                         DEBUG(10,("get_entry_val: gid = %u\n", (unsigned int)ace_entry->unix_ug.gid ));
 162                         return (uint32_t)ace_entry->unix_ug.gid;
 163                 case WORLD_ACE:
 164                 default:
 165                         DEBUG(10,("get_entry_val: world ace\n"));
 166                         return (uint32_t)-1;
 167         }
 168 }
 169
 170 /************************************************************************
 171  Create the on-disk format (always v2 now). Caller must free.
 172 ************************************************************************/
 173
 174 static char *create_pai_buf_v2(canon_ace *file_ace_list,
 175                                 canon_ace *dir_ace_list,
 176                                 uint16_t sd_type,
 177                                 size_t *store_size)
 178 {
 179         char *pai_buf = NULL;
 180         canon_ace *ace_list = NULL;
 181         char *entry_offset = NULL;
 182         unsigned int num_entries = 0;
 183         unsigned int num_def_entries = 0;
 184         unsigned int i;
 185
 186         for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
 187                 num_entries++;
 188         }
 189
 190         for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
 191                 num_def_entries++;
 192         }
 193
 194         DEBUG(10,("create_pai_buf_v2: num_entries = %u, num_def_entries = %u\n", num_entries, num_def_entries ));
 195
 196         *store_size = PAI_V2_ENTRIES_BASE +
 197                 ((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH);
 198
 199         pai_buf = (char *)SMB_MALLOC(*store_size);
 200         if (!pai_buf) {
 201                 return NULL;
 202         }
 203
 204         /* Set up the header. */
 205         memset(pai_buf, '\0', PAI_V2_ENTRIES_BASE);
 206         SCVAL(pai_buf,PAI_VERSION_OFFSET,PAI_V2_VERSION);
 207         SSVAL(pai_buf,PAI_V2_TYPE_OFFSET, sd_type);
 208         SSVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET,num_entries);
 209         SSVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET,num_def_entries);
 210
 211         DEBUG(10,("create_pai_buf_v2: sd_type = 0x%x\n",
 212                         (unsigned int)sd_type ));
 213
 214         entry_offset = pai_buf + PAI_V2_ENTRIES_BASE;
 215
 216         i = 0;
 217         for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
 218                 uint8_t type_val = (uint8_t)ace_list->owner_type;
 219                 uint32_t entry_val = get_entry_val(ace_list);
 220
 221                 SCVAL(entry_offset,0,ace_list->ace_flags);
 222                 SCVAL(entry_offset,1,type_val);
 223                 SIVAL(entry_offset,2,entry_val);
 224                 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
 225                         i,
 226                         (unsigned int)ace_list->ace_flags,
 227                         (unsigned int)type_val,
 228                         (unsigned int)entry_val ));
 229                 i++;
 230                 entry_offset += PAI_V2_ENTRY_LENGTH;
 231         }
 232
 233         for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
 234                 uint8_t type_val = (uint8_t)ace_list->owner_type;
 235                 uint32_t entry_val = get_entry_val(ace_list);
 236
 237                 SCVAL(entry_offset,0,ace_list->ace_flags);
 238                 SCVAL(entry_offset,1,type_val);
 239                 SIVAL(entry_offset,2,entry_val);
 240                 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
 241                         i,
 242                         (unsigned int)ace_list->ace_flags,
 243                         (unsigned int)type_val,
 244                         (unsigned int)entry_val ));
 245                 i++;
 246                 entry_offset += PAI_V2_ENTRY_LENGTH;
 247         }
 248
 249         return pai_buf;
 250 }
 251
 252 /************************************************************************
 253  Store the user.SAMBA_PAI attribute on disk.
 254 ************************************************************************/
 255
 256 static void store_inheritance_attributes(files_struct *fsp,
 257                                         canon_ace *file_ace_list,
 258                                         canon_ace *dir_ace_list,
 259                                         uint16_t sd_type)
 260 {
 261         int ret;
 262         size_t store_size;
 263         char *pai_buf;
 264
 265         if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
 266                 return;
 267         }
 268
 269         pai_buf = create_pai_buf_v2(file_ace_list, dir_ace_list,
 270                                 sd_type, &store_size);
 271
 272         if (fsp->fh->fd != -1) {
 273                 ret = SMB_VFS_FSETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
 274                                 pai_buf, store_size, 0);
 275         } else {
 276                 ret = SMB_VFS_SETXATTR(fsp->conn, fsp->fsp_name->base_name,
 277                                        SAMBA_POSIX_INHERITANCE_EA_NAME,
 278                                        pai_buf, store_size, 0);
 279         }
 280
 281         SAFE_FREE(pai_buf);
 282
 283         DEBUG(10,("store_inheritance_attribute: type 0x%x for file %s\n",
 284                 (unsigned int)sd_type,
 285                 fsp_str_dbg(fsp)));
 286
 287         if (ret == -1 && !no_acl_syscall_error(errno)) {
 288                 DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) ));
 289         }
 290 }
 291
 292 /************************************************************************
 293  Delete the in memory inheritance info.
 294 ************************************************************************/
 295
 296 static void free_inherited_info(struct pai_val *pal)
 297 {
 298         if (pal) {
 299                 struct pai_entry *paie, *paie_next;
 300                 for (paie = pal->entry_list; paie; paie = paie_next) {
 301                         paie_next = paie->next;
 302                         SAFE_FREE(paie);
 303                 }
 304                 for (paie = pal->def_entry_list; paie; paie = paie_next) {
 305                         paie_next = paie->next;
 306                         SAFE_FREE(paie);
 307                 }
 308                 SAFE_FREE(pal);
 309         }
 310 }
 311
 312 /************************************************************************
 313  Get any stored ACE flags.
 314 ************************************************************************/
 315
 316 static uint16_t get_pai_flags(struct pai_val *pal, canon_ace *ace_entry, bool default_ace)
 317 {
 318         struct pai_entry *paie;
 319
 320         if (!pal) {
 321                 return 0;
 322         }
 323
 324         /* If the entry exists it is inherited. */
 325         for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) {
 326                 if (ace_entry->owner_type == paie->owner_type &&
 327                                 get_entry_val(ace_entry) == get_pai_entry_val(paie))
 328                         return paie->ace_flags;
 329         }
 330         return 0;
 331 }
 332
 333 /************************************************************************
 334  Ensure an attribute just read is valid - v1.
 335 ************************************************************************/
 336
 337 static bool check_pai_ok_v1(const char *pai_buf, size_t pai_buf_data_size)
 338 {
 339         uint16 num_entries;
 340         uint16 num_def_entries;
 341
 342         if (pai_buf_data_size < PAI_V1_ENTRIES_BASE) {
 343                 /* Corrupted - too small. */
 344                 return false;
 345         }
 346
 347         if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V1_VERSION) {
 348                 return false;
 349         }
 350
 351         num_entries = SVAL(pai_buf,PAI_V1_NUM_ENTRIES_OFFSET);
 352         num_def_entries = SVAL(pai_buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
 353
 354         /* Check the entry lists match. */
 355         /* Each entry is 5 bytes (type plus 4 bytes of uid or gid). */
 356
 357         if (((num_entries + num_def_entries)*PAI_V1_ENTRY_LENGTH) +
 358                         PAI_V1_ENTRIES_BASE != pai_buf_data_size) {
 359                 return false;
 360         }
 361
 362         return true;
 363 }
 364
 365 /************************************************************************
 366  Ensure an attribute just read is valid - v2.
 367 ************************************************************************/
 368
 369 static bool check_pai_ok_v2(const char *pai_buf, size_t pai_buf_data_size)
 370 {
 371         uint16 num_entries;
 372         uint16 num_def_entries;
 373
 374         if (pai_buf_data_size < PAI_V2_ENTRIES_BASE) {
 375                 /* Corrupted - too small. */
 376                 return false;
 377         }
 378
 379         if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V2_VERSION) {
 380                 return false;
 381         }
 382
 383         num_entries = SVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET);
 384         num_def_entries = SVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
 385
 386         /* Check the entry lists match. */
 387         /* Each entry is 6 bytes (flags + type + 4 bytes of uid or gid). */
 388
 389         if (((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH) +
 390                         PAI_V2_ENTRIES_BASE != pai_buf_data_size) {
 391                 return false;
 392         }
 393
 394         return true;
 395 }
 396
 397 /************************************************************************
 398  Decode the owner.
 399 ************************************************************************/
 400
 401 static bool get_pai_owner_type(struct pai_entry *paie, const char *entry_offset)
 402 {
 403         paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
 404         switch( paie->owner_type) {
 405                 case UID_ACE:
 406                         paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
 407                         DEBUG(10,("get_pai_owner_type: uid = %u\n",
 408                                 (unsigned int)paie->unix_ug.uid ));
 409                         break;
 410                 case GID_ACE:
 411                         paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
 412                         DEBUG(10,("get_pai_owner_type: gid = %u\n",
 413                                 (unsigned int)paie->unix_ug.gid ));
 414                         break;
 415                 case WORLD_ACE:
 416                         paie->unix_ug.world = -1;
 417                         DEBUG(10,("get_pai_owner_type: world ace\n"));
 418                         break;
 419                 default:
 420                         DEBUG(10,("get_pai_owner_type: unknown type %u\n",
 421                                 (unsigned int)paie->owner_type ));
 422                         return false;
 423         }
 424         return true;
 425 }
 426
 427 /************************************************************************
 428  Process v2 entries.
 429 ************************************************************************/
 430
 431 static const char *create_pai_v1_entries(struct pai_val *paiv,
 432                                 const char *entry_offset,
 433                                 bool def_entry)
 434 {
 435         int i;
 436
 437         for (i = 0; i < paiv->num_entries; i++) {
 438                 struct pai_entry *paie = SMB_MALLOC_P(struct pai_entry);
 439                 if (!paie) {
 440                         return NULL;
 441                 }
 442
 443                 paie->ace_flags = SEC_ACE_FLAG_INHERITED_ACE;
 444                 if (!get_pai_owner_type(paie, entry_offset)) {
 445                         return NULL;
 446                 }
 447
 448                 if (!def_entry) {
 449                         DLIST_ADD(paiv->entry_list, paie);
 450                 } else {
 451                         DLIST_ADD(paiv->def_entry_list, paie);
 452                 }
 453                 entry_offset += PAI_V1_ENTRY_LENGTH;
 454         }
 455         return entry_offset;
 456 }
 457
 458 /************************************************************************
 459  Convert to in-memory format from version 1.
 460 ************************************************************************/
 461
 462 static struct pai_val *create_pai_val_v1(const char *buf, size_t size)
 463 {
 464         const char *entry_offset;
 465         struct pai_val *paiv = NULL;
 466
 467         if (!check_pai_ok_v1(buf, size)) {
 468                 return NULL;
 469         }
 470
 471         paiv = SMB_MALLOC_P(struct pai_val);
 472         if (!paiv) {
 473                 return NULL;
 474         }
 475
 476         memset(paiv, '\0', sizeof(struct pai_val));
 477
 478         paiv->sd_type = (CVAL(buf,PAI_V1_FLAG_OFFSET) == PAI_V1_ACL_FLAG_PROTECTED) ?
 479                         SE_DESC_DACL_PROTECTED : 0;
 480
 481         paiv->num_entries = SVAL(buf,PAI_V1_NUM_ENTRIES_OFFSET);
 482         paiv->num_def_entries = SVAL(buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
 483
 484         entry_offset = buf + PAI_V1_ENTRIES_BASE;
 485
 486         DEBUG(10,("create_pai_val: num_entries = %u, num_def_entries = %u\n",
 487                         paiv->num_entries, paiv->num_def_entries ));
 488
 489         entry_offset = create_pai_v1_entries(paiv, entry_offset, false);
 490         if (entry_offset == NULL) {
 491                 free_inherited_info(paiv);
 492                 return NULL;
 493         }
 494         entry_offset = create_pai_v1_entries(paiv, entry_offset, true);
 495         if (entry_offset == NULL) {
 496                 free_inherited_info(paiv);
 497                 return NULL;
 498         }
 499
 500         return paiv;
 501 }
 502
 503 /************************************************************************
 504  Process v2 entries.
 505 ************************************************************************/
 506
 507 static const char *create_pai_v2_entries(struct pai_val *paiv,
 508                                 unsigned int num_entries,
 509                                 const char *entry_offset,
 510                                 bool def_entry)
 511 {
 512         unsigned int i;
 513
 514         for (i = 0; i < num_entries; i++) {
 515                 struct pai_entry *paie = SMB_MALLOC_P(struct pai_entry);
 516                 if (!paie) {
 517                         return NULL;
 518                 }
 519
 520                 paie->ace_flags = CVAL(entry_offset,0);
 521
 522                 if (!get_pai_owner_type(paie, entry_offset+1)) {
 523                         return NULL;
 524                 }
 525                 if (!def_entry) {
 526                         DLIST_ADD(paiv->entry_list, paie);
 527                 } else {
 528                         DLIST_ADD(paiv->def_entry_list, paie);
 529                 }
 530                 entry_offset += PAI_V2_ENTRY_LENGTH;
 531         }
 532         return entry_offset;
 533 }
 534
 535 /************************************************************************
 536  Convert to in-memory format from version 2.
 537 ************************************************************************/
 538
 539 static struct pai_val *create_pai_val_v2(const char *buf, size_t size)
 540 {
 541         const char *entry_offset;
 542         struct pai_val *paiv = NULL;
 543
 544         if (!check_pai_ok_v2(buf, size)) {
 545                 return NULL;
 546         }
 547
 548         paiv = SMB_MALLOC_P(struct pai_val);
 549         if (!paiv) {
 550                 return NULL;
 551         }
 552
 553         memset(paiv, '\0', sizeof(struct pai_val));
 554
 555         paiv->sd_type = SVAL(buf,PAI_V2_TYPE_OFFSET);
 556
 557         paiv->num_entries = SVAL(buf,PAI_V2_NUM_ENTRIES_OFFSET);
 558         paiv->num_def_entries = SVAL(buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
 559
 560         entry_offset = buf + PAI_V2_ENTRIES_BASE;
 561
 562         DEBUG(10,("create_pai_val_v2: sd_type = 0x%x num_entries = %u, num_def_entries = %u\n",
 563                         (unsigned int)paiv->sd_type,
 564                         paiv->num_entries, paiv->num_def_entries ));
 565
 566         entry_offset = create_pai_v2_entries(paiv, paiv->num_entries,
 567                                 entry_offset, false);
 568         if (entry_offset == NULL) {
 569                 free_inherited_info(paiv);
 570                 return NULL;
 571         }
 572         entry_offset = create_pai_v2_entries(paiv, paiv->num_def_entries,
 573                                 entry_offset, true);
 574         if (entry_offset == NULL) {
 575                 free_inherited_info(paiv);
 576                 return NULL;
 577         }
 578
 579         return paiv;
 580 }
 581
 582 /************************************************************************
 583  Convert to in-memory format - from either version 1 or 2.
 584 ************************************************************************/
 585
 586 static struct pai_val *create_pai_val(const char *buf, size_t size)
 587 {
 588         if (size < 1) {
 589                 return NULL;
 590         }
 591         if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V1_VERSION) {
 592                 return create_pai_val_v1(buf, size);
 593         } else if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V2_VERSION) {
 594                 return create_pai_val_v2(buf, size);
 595         } else {
 596                 return NULL;
 597         }
 598 }
 599
 600 /************************************************************************
 601  Load the user.SAMBA_PAI attribute.
 602 ************************************************************************/
 603
 604 static struct pai_val *fload_inherited_info(files_struct *fsp)
 605 {
 606         char *pai_buf;
 607         size_t pai_buf_size = 1024;
 608         struct pai_val *paiv = NULL;
 609         ssize_t ret;
 610
 611         if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
 612                 return NULL;
 613         }
 614
 615         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) {
 616                 return NULL;
 617         }
 618
 619         do {
 620                 if (fsp->fh->fd != -1) {
 621                         ret = SMB_VFS_FGETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
 622                                         pai_buf, pai_buf_size);
 623                 } else {
 624                         ret = SMB_VFS_GETXATTR(fsp->conn,
 625                                                fsp->fsp_name->base_name,
 626                                                SAMBA_POSIX_INHERITANCE_EA_NAME,
 627                                                pai_buf, pai_buf_size);
 628                 }
 629
 630                 if (ret == -1) {
 631                         if (errno != ERANGE) {
 632                                 break;
 633                         }
 634                         /* Buffer too small - enlarge it. */
 635                         pai_buf_size *= 2;
 636                         SAFE_FREE(pai_buf);
 637                         if (pai_buf_size > 1024*1024) {
 638                                 return NULL; /* Limit malloc to 1mb. */
 639                         }
 640                         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
 641                                 return NULL;
 642                 }
 643         } while (ret == -1);
 644
 645         DEBUG(10,("load_inherited_info: ret = %lu for file %s\n",
 646                   (unsigned long)ret, fsp_str_dbg(fsp)));
 647
 648         if (ret == -1) {
 649                 /* No attribute or not supported. */
 650 #if defined(ENOATTR)
 651                 if (errno != ENOATTR)
 652                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 653 #else
 654                 if (errno != ENOSYS)
 655                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 656 #endif
 657                 SAFE_FREE(pai_buf);
 658                 return NULL;
 659         }
 660
 661         paiv = create_pai_val(pai_buf, ret);
 662
 663         if (paiv) {
 664                 DEBUG(10,("load_inherited_info: ACL type is 0x%x for file %s\n",
 665                           (unsigned int)paiv->sd_type, fsp_str_dbg(fsp)));
 666         }
 667
 668         SAFE_FREE(pai_buf);
 669         return paiv;
 670 }
 671
 672 /************************************************************************
 673  Load the user.SAMBA_PAI attribute.
 674 ************************************************************************/
 675
 676 static struct pai_val *load_inherited_info(const struct connection_struct *conn,
 677                                            const char *fname)
 678 {
 679         char *pai_buf;
 680         size_t pai_buf_size = 1024;
 681         struct pai_val *paiv = NULL;
 682         ssize_t ret;
 683
 684         if (!lp_map_acl_inherit(SNUM(conn))) {
 685                 return NULL;
 686         }
 687
 688         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) {
 689                 return NULL;
 690         }
 691
 692         do {
 693                 ret = SMB_VFS_GETXATTR(conn, fname,
 694                                        SAMBA_POSIX_INHERITANCE_EA_NAME,
 695                                        pai_buf, pai_buf_size);
 696
 697                 if (ret == -1) {
 698                         if (errno != ERANGE) {
 699                                 break;
 700                         }
 701                         /* Buffer too small - enlarge it. */
 702                         pai_buf_size *= 2;
 703                         SAFE_FREE(pai_buf);
 704                         if (pai_buf_size > 1024*1024) {
 705                                 return NULL; /* Limit malloc to 1mb. */
 706                         }
 707                         if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
 708                                 return NULL;
 709                 }
 710         } while (ret == -1);
 711
 712         DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fname));
 713
 714         if (ret == -1) {
 715                 /* No attribute or not supported. */
 716 #if defined(ENOATTR)
 717                 if (errno != ENOATTR)
 718                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 719 #else
 720                 if (errno != ENOSYS)
 721                         DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
 722 #endif
 723                 SAFE_FREE(pai_buf);
 724                 return NULL;
 725         }
 726
 727         paiv = create_pai_val(pai_buf, ret);
 728
 729         if (paiv) {
 730                 DEBUG(10,("load_inherited_info: ACL type 0x%x for file %s\n",
 731                         (unsigned int)paiv->sd_type,
 732                         fname));
 733         }
 734
 735         SAFE_FREE(pai_buf);
 736         return paiv;
 737 }
 738
 739 /****************************************************************************
 740  Functions to manipulate the internal ACE format.
 741 ****************************************************************************/
 742
 743 /****************************************************************************
 744  Count a linked list of canonical ACE entries.
 745 ****************************************************************************/
 746
 747 static size_t count_canon_ace_list( canon_ace *l_head )
 748 {
 749         size_t count = 0;
 750         canon_ace *ace;
 751
 752         for (ace = l_head; ace; ace = ace->next)
 753                 count++;
 754
 755         return count;
 756 }
 757
 758 /****************************************************************************
 759  Free a linked list of canonical ACE entries.
 760 ****************************************************************************/
 761
 762 static void free_canon_ace_list( canon_ace *l_head )
 763 {
 764         canon_ace *list, *next;
 765
 766         for (list = l_head; list; list = next) {
 767                 next = list->next;
 768                 DLIST_REMOVE(l_head, list);
 769                 SAFE_FREE(list);
 770         }
 771 }
 772
 773 /****************************************************************************
 774  Function to duplicate a canon_ace entry.
 775 ****************************************************************************/
 776
 777 static canon_ace *dup_canon_ace( canon_ace *src_ace)
 778 {
 779         canon_ace *dst_ace = SMB_MALLOC_P(canon_ace);
 780
 781         if (dst_ace == NULL)
 782                 return NULL;
 783
 784         *dst_ace = *src_ace;
 785         dst_ace->prev = dst_ace->next = NULL;
 786         return dst_ace;
 787 }
 788
 789 /****************************************************************************
 790  Print out a canon ace.
 791 ****************************************************************************/
 792
 793 static void print_canon_ace(canon_ace *pace, int num)
 794 {
 795         dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
 796         dbgtext( "SID = %s ", sid_string_dbg(&pace->trustee));
 797         if (pace->owner_type == UID_ACE) {
 798                 const char *u_name = uidtoname(pace->unix_ug.uid);
 799                 dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.uid, u_name );
 800         } else if (pace->owner_type == GID_ACE) {
 801                 char *g_name = gidtoname(pace->unix_ug.gid);
 802                 dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.gid, g_name );
 803         } else
 804                 dbgtext( "other ");
 805         switch (pace->type) {
 806                 case SMB_ACL_USER:
 807                         dbgtext( "SMB_ACL_USER ");
 808                         break;
 809                 case SMB_ACL_USER_OBJ:
 810                         dbgtext( "SMB_ACL_USER_OBJ ");
 811                         break;
 812                 case SMB_ACL_GROUP:
 813                         dbgtext( "SMB_ACL_GROUP ");
 814                         break;
 815                 case SMB_ACL_GROUP_OBJ:
 816                         dbgtext( "SMB_ACL_GROUP_OBJ ");
 817                         break;
 818                 case SMB_ACL_OTHER:
 819                         dbgtext( "SMB_ACL_OTHER ");
 820                         break;
 821                 default:
 822                         dbgtext( "MASK " );
 823                         break;
 824         }
 825
 826         dbgtext( "ace_flags = 0x%x ", (unsigned int)pace->ace_flags);
 827         dbgtext( "perms ");
 828         dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
 829         dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
 830         dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
 831 }
 832
 833 /****************************************************************************
 834  Print out a canon ace list.
 835 ****************************************************************************/
 836
 837 static void print_canon_ace_list(const char *name, canon_ace *ace_list)
 838 {
 839         int count = 0;
 840
 841         if( DEBUGLVL( 10 )) {
 842                 dbgtext( "print_canon_ace_list: %s\n", name );
 843                 for (;ace_list; ace_list = ace_list->next, count++)
 844                         print_canon_ace(ace_list, count );
 845         }
 846 }
 847
 848 /****************************************************************************
 849  Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
 850 ****************************************************************************/
 851
 852 static mode_t convert_permset_to_mode_t(connection_struct *conn, SMB_ACL_PERMSET_T permset)
 853 {
 854         mode_t ret = 0;
 855
 856         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRUSR : 0);
 857         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
 858         ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0);
 859
 860         return ret;
 861 }
 862
 863 /****************************************************************************
 864  Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
 865 ****************************************************************************/
 866
 867 static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask)
 868 {
 869         mode_t ret = 0;
 870
 871         if (mode & r_mask)
 872                 ret |= S_IRUSR;
 873         if (mode & w_mask)
 874                 ret |= S_IWUSR;
 875         if (mode & x_mask)
 876                 ret |= S_IXUSR;
 877
 878         return ret;
 879 }
 880
 881 /****************************************************************************
 882  Map canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits) to
 883  an SMB_ACL_PERMSET_T.
 884 ****************************************************************************/
 885
 886 static int map_acl_perms_to_permset(connection_struct *conn, mode_t mode, SMB_ACL_PERMSET_T *p_permset)
 887 {
 888         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1)
 889                 return -1;
 890         if (mode & S_IRUSR) {
 891                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1)
 892                         return -1;
 893         }
 894         if (mode & S_IWUSR) {
 895                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1)
 896                         return -1;
 897         }
 898         if (mode & S_IXUSR) {
 899                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1)
 900                         return -1;
 901         }
 902         return 0;
 903 }
 904
 905 /****************************************************************************
 906  Function to create owner and group SIDs from a SMB_STRUCT_STAT.
 907 ****************************************************************************/
 908
 909 void create_file_sids(const SMB_STRUCT_STAT *psbuf, DOM_SID *powner_sid, DOM_SID *pgroup_sid)
 910 {
 911         uid_to_sid( powner_sid, psbuf->st_ex_uid );
 912         gid_to_sid( pgroup_sid, psbuf->st_ex_gid );
 913 }
 914
 915 /****************************************************************************
 916  Merge aces with a common sid - if both are allow or deny, OR the permissions together and
 917  delete the second one. If the first is deny, mask the permissions off and delete the allow
 918  if the permissions become zero, delete the deny if the permissions are non zero.
 919 ****************************************************************************/
 920
 921 static void merge_aces( canon_ace **pp_list_head, bool dir_acl)
 922 {
 923         canon_ace *l_head = *pp_list_head;
 924         canon_ace *curr_ace_outer;
 925         canon_ace *curr_ace_outer_next;
 926
 927         /*
 928          * First, merge allow entries with identical SIDs, and deny entries
 929          * with identical SIDs.
 930          */
 931
 932         for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
 933                 canon_ace *curr_ace;
 934                 canon_ace *curr_ace_next;
 935
 936                 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
 937
 938                 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
 939                         bool can_merge = false;
 940
 941                         curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
 942
 943                         /* For file ACLs we can merge if the SIDs and ALLOW/DENY
 944                          * types are the same. For directory acls we must also
 945                          * ensure the POSIX ACL types are the same. */
 946
 947                         if (!dir_acl) {
 948                                 can_merge = (sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
 949                                                 (curr_ace->attr == curr_ace_outer->attr));
 950                         } else {
 951                                 can_merge = (sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
 952                                                 (curr_ace->type == curr_ace_outer->type) &&
 953                                                 (curr_ace->attr == curr_ace_outer->attr));
 954                         }
 955
 956                         if (can_merge) {
 957                                 if( DEBUGLVL( 10 )) {
 958                                         dbgtext("merge_aces: Merging ACE's\n");
 959                                         print_canon_ace( curr_ace_outer, 0);
 960                                         print_canon_ace( curr_ace, 0);
 961                                 }
 962
 963                                 /* Merge two allow or two deny ACE's. */
 964
 965                                 /* Theoretically we shouldn't merge a dir ACE if
 966                                  * one ACE has the CI flag set, and the other
 967                                  * ACE has the OI flag set, but this is rare
 968                                  * enough we can ignore it. */
 969
 970                                 curr_ace_outer->perms |= curr_ace->perms;
 971                                 curr_ace_outer->ace_flags |= curr_ace->ace_flags;
 972                                 DLIST_REMOVE(l_head, curr_ace);
 973                                 SAFE_FREE(curr_ace);
 974                                 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
 975                         }
 976                 }
 977         }
 978
 979         /*
 980          * Now go through and mask off allow permissions with deny permissions.
 981          * We can delete either the allow or deny here as we know that each SID
 982          * appears only once in the list.
 983          */
 984
 985         for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
 986                 canon_ace *curr_ace;
 987                 canon_ace *curr_ace_next;
 988
 989                 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
 990
 991                 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
 992
 993                         curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
 994
 995                         /*
 996                          * Subtract ACE's with different entries. Due to the ordering constraints
 997                          * we've put on the ACL, we know the deny must be the first one.
 998                          */
 999
1000                         if (sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
1001                                 (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
1002
1003                                 if( DEBUGLVL( 10 )) {
1004                                         dbgtext("merge_aces: Masking ACE's\n");
1005                                         print_canon_ace( curr_ace_outer, 0);
1006                                         print_canon_ace( curr_ace, 0);
1007                                 }
1008
1009                                 curr_ace->perms &= ~curr_ace_outer->perms;
1010
1011                                 if (curr_ace->perms == 0) {
1012
1013                                         /*
1014                                          * The deny overrides the allow. Remove the allow.
1015                                          */
1016
1017                                         DLIST_REMOVE(l_head, curr_ace);
1018                                         SAFE_FREE(curr_ace);
1019                                         curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
1020
1021                                 } else {
1022
1023                                         /*
1024                                          * Even after removing permissions, there
1025                                          * are still allow permissions - delete the deny.
1026                                          * It is safe to delete the deny here,
1027                                          * as we are guarenteed by the deny first
1028                                          * ordering that all the deny entries for
1029                                          * this SID have already been merged into one
1030                                          * before we can get to an allow ace.
1031                                          */
1032
1033                                         DLIST_REMOVE(l_head, curr_ace_outer);
1034                                         SAFE_FREE(curr_ace_outer);
1035                                         break;
1036                                 }
1037                         }
1038
1039                 } /* end for curr_ace */
1040         } /* end for curr_ace_outer */
1041
1042         /* We may have modified the list. */
1043
1044         *pp_list_head = l_head;
1045 }
1046
1047 /****************************************************************************
1048  Check if we need to return NT4.x compatible ACL entries.
1049 ****************************************************************************/
1050
1051 bool nt4_compatible_acls(void)
1052 {
1053         int compat = lp_acl_compatibility();
1054
1055         if (compat == ACL_COMPAT_AUTO) {
1056                 enum remote_arch_types ra_type = get_remote_arch();
1057
1058                 /* Automatically adapt to client */
1059                 return (ra_type <= RA_WINNT);
1060         } else
1061                 return (compat == ACL_COMPAT_WINNT);
1062 }
1063
1064
1065 /****************************************************************************
1066  Map canon_ace perms to permission bits NT.
1067  The attr element is not used here - we only process deny entries on set,
1068  not get. Deny entries are implicit on get with ace->perms = 0.
1069 ****************************************************************************/
1070
1071 uint32_t map_canon_ace_perms(int snum,
1072                                 enum security_ace_type *pacl_type,
1073                                 mode_t perms,
1074                                 bool directory_ace)
1075 {
1076         uint32_t nt_mask = 0;
1077
1078         *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
1079
1080         if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
1081                 if (directory_ace) {
1082                         nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
1083                 } else {
1084                         nt_mask = (UNIX_ACCESS_RWX & ~DELETE_ACCESS);
1085                 }
1086         } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
1087                 /*
1088                  * Windows NT refuses to display ACEs with no permissions in them (but
1089                  * they are perfectly legal with Windows 2000). If the ACE has empty
1090                  * permissions we cannot use 0, so we use the otherwise unused
1091                  * WRITE_OWNER permission, which we ignore when we set an ACL.
1092                  * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
1093                  * to be changed in the future.
1094                  */
1095
1096                 if (nt4_compatible_acls())
1097                         nt_mask = UNIX_ACCESS_NONE;
1098                 else
1099                         nt_mask = 0;
1100         } else {
1101                 if (directory_ace) {
1102                         nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
1103                         nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
1104                         nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
1105                 } else {
1106                         nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
1107                         nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
1108                         nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
1109                 }
1110         }
1111
1112         if ((perms & S_IWUSR) && lp_dos_filemode(snum)) {
1113                 nt_mask |= (SEC_STD_WRITE_DAC|SEC_STD_WRITE_OWNER|DELETE_ACCESS);
1114         }
1115
1116         DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
1117                         (unsigned int)perms, (unsigned int)nt_mask ));
1118
1119         return nt_mask;
1120 }
1121
1122 /****************************************************************************
1123  Map NT perms to a UNIX mode_t.
1124 ****************************************************************************/
1125
1126 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA|FILE_READ_ATTRIBUTES)
1127 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA|FILE_WRITE_ATTRIBUTES)
1128 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
1129
1130 static mode_t map_nt_perms( uint32 *mask, int type)
1131 {
1132         mode_t mode = 0;
1133
1134         switch(type) {
1135         case S_IRUSR:
1136                 if((*mask) & GENERIC_ALL_ACCESS)
1137                         mode = S_IRUSR|S_IWUSR|S_IXUSR;
1138                 else {
1139                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
1140                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
1141                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
1142                 }
1143                 break;
1144         case S_IRGRP:
1145                 if((*mask) & GENERIC_ALL_ACCESS)
1146                         mode = S_IRGRP|S_IWGRP|S_IXGRP;
1147                 else {
1148                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
1149                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
1150                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
1151                 }
1152                 break;
1153         case S_IROTH:
1154                 if((*mask) & GENERIC_ALL_ACCESS)
1155                         mode = S_IROTH|S_IWOTH|S_IXOTH;
1156                 else {
1157                         mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
1158                         mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
1159                         mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
1160                 }
1161                 break;
1162         }
1163
1164         return mode;
1165 }
1166
1167 /****************************************************************************
1168  Unpack a SEC_DESC into a UNIX owner and group.
1169 ****************************************************************************/
1170
1171 NTSTATUS unpack_nt_owners(int snum, uid_t *puser, gid_t *pgrp, uint32 security_info_sent, const SEC_DESC *psd)
1172 {
1173         DOM_SID owner_sid;
1174         DOM_SID grp_sid;
1175
1176         *puser = (uid_t)-1;
1177         *pgrp = (gid_t)-1;
1178
1179         if(security_info_sent == 0) {
1180                 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1181                 return NT_STATUS_OK;
1182         }
1183
1184         /*
1185          * Validate the owner and group SID's.
1186          */
1187
1188         memset(&owner_sid, '\0', sizeof(owner_sid));
1189         memset(&grp_sid, '\0', sizeof(grp_sid));
1190
1191         DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1192
1193         /*
1194          * Don't immediately fail if the owner sid cannot be validated.
1195          * This may be a group chown only set.
1196          */
1197
1198         if (security_info_sent & OWNER_SECURITY_INFORMATION) {
1199                 sid_copy(&owner_sid, psd->owner_sid);
1200                 if (!sid_to_uid(&owner_sid, puser)) {
1201                         if (lp_force_unknown_acl_user(snum)) {
1202                                 /* this allows take ownership to work
1203                                  * reasonably */
1204                                 *puser = current_user.ut.uid;
1205                         } else {
1206                                 DEBUG(3,("unpack_nt_owners: unable to validate"
1207                                          " owner sid for %s\n",
1208                                          sid_string_dbg(&owner_sid)));
1209                                 return NT_STATUS_INVALID_OWNER;
1210                         }
1211                 }
1212                 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1213                          (unsigned int)*puser ));
1214         }
1215
1216         /*
1217          * Don't immediately fail if the group sid cannot be validated.
1218          * This may be an owner chown only set.
1219          */
1220
1221         if (security_info_sent & GROUP_SECURITY_INFORMATION) {
1222                 sid_copy(&grp_sid, psd->group_sid);
1223                 if (!sid_to_gid( &grp_sid, pgrp)) {
1224                         if (lp_force_unknown_acl_user(snum)) {
1225                                 /* this allows take group ownership to work
1226                                  * reasonably */
1227                                 *pgrp = current_user.ut.gid;
1228                         } else {
1229                                 DEBUG(3,("unpack_nt_owners: unable to validate"
1230                                          " group sid.\n"));
1231                                 return NT_STATUS_INVALID_OWNER;
1232                         }
1233                 }
1234                 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1235                          (unsigned int)*pgrp));
1236         }
1237
1238         DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1239
1240         return NT_STATUS_OK;
1241 }
1242
1243 /****************************************************************************
1244  Ensure the enforced permissions for this share apply.
1245 ****************************************************************************/
1246
1247 static void apply_default_perms(const struct share_params *params,
1248                                 const bool is_directory, canon_ace *pace,
1249                                 mode_t type)
1250 {
1251         mode_t and_bits = (mode_t)0;
1252         mode_t or_bits = (mode_t)0;
1253
1254         /* Get the initial bits to apply. */
1255
1256         if (is_directory) {
1257                 and_bits = lp_dir_security_mask(params->service);
1258                 or_bits = lp_force_dir_security_mode(params->service);
1259         } else {
1260                 and_bits = lp_security_mask(params->service);
1261                 or_bits = lp_force_security_mode(params->service);
1262         }
1263
1264         /* Now bounce them into the S_USR space. */
1265         switch(type) {
1266         case S_IRUSR:
1267                 /* Ensure owner has read access. */
1268                 pace->perms |= S_IRUSR;
1269                 if (is_directory)
1270                         pace->perms |= (S_IWUSR|S_IXUSR);
1271                 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1272                 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1273                 break;
1274         case S_IRGRP:
1275                 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1276                 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1277                 break;
1278         case S_IROTH:
1279                 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1280                 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1281                 break;
1282         }
1283
1284         pace->perms = ((pace->perms & and_bits)|or_bits);
1285 }
1286
1287 /****************************************************************************
1288  Check if a given uid/SID is in a group gid/SID. This is probably very
1289  expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1290 ****************************************************************************/
1291
1292 static bool uid_entry_in_group( canon_ace *uid_ace, canon_ace *group_ace )
1293 {
1294         const char *u_name = NULL;
1295
1296         /* "Everyone" always matches every uid. */
1297
1298         if (sid_equal(&group_ace->trustee, &global_sid_World))
1299                 return True;
1300
1301         /*
1302          * if it's the current user, we already have the unix token
1303          * and don't need to do the complex user_in_group_sid() call
1304          */
1305         if (uid_ace->unix_ug.uid == current_user.ut.uid) {
1306                 size_t i;
1307
1308                 if (group_ace->unix_ug.gid == current_user.ut.gid) {
1309                         return True;
1310                 }
1311
1312                 for (i=0; i < current_user.ut.ngroups; i++) {
1313                         if (group_ace->unix_ug.gid == current_user.ut.groups[i]) {
1314                                 return True;
1315                         }
1316                 }
1317         }
1318
1319         /* u_name talloc'ed off tos. */
1320         u_name = uidtoname(uid_ace->unix_ug.uid);
1321         if (!u_name) {
1322                 return False;
1323         }
1324
1325         /*
1326          * user_in_group_sid() uses create_token_from_username()
1327          * which creates an artificial NT token given just a username,
1328          * so this is not reliable for users from foreign domains
1329          * exported by winbindd!
1330          */
1331         return user_in_group_sid(u_name, &group_ace->trustee);
1332 }
1333
1334 /****************************************************************************
1335  A well formed POSIX file or default ACL has at least 3 entries, a
1336  SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1337  In addition, the owner must always have at least read access.
1338  When using this call on get_acl, the pst struct is valid and contains
1339  the mode of the file. When using this call on set_acl, the pst struct has
1340  been modified to have a mode containing the default for this file or directory
1341  type.
1342 ****************************************************************************/
1343
1344 static bool ensure_canon_entry_valid(canon_ace **pp_ace,
1345                                      const struct share_params *params,
1346                                      const bool is_directory,
1347                                                         const DOM_SID *pfile_owner_sid,
1348                                                         const DOM_SID *pfile_grp_sid,
1349                                                         const SMB_STRUCT_STAT *pst,
1350                                                         bool setting_acl)
1351 {
1352         canon_ace *pace;
1353         bool got_user = False;
1354         bool got_grp = False;
1355         bool got_other = False;
1356         canon_ace *pace_other = NULL;
1357
1358         for (pace = *pp_ace; pace; pace = pace->next) {
1359                 if (pace->type == SMB_ACL_USER_OBJ) {
1360
1361                         if (setting_acl)
1362                                 apply_default_perms(params, is_directory, pace, S_IRUSR);
1363                         got_user = True;
1364
1365                 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1366
1367                         /*
1368                          * Ensure create mask/force create mode is respected on set.
1369                          */
1370
1371                         if (setting_acl)
1372                                 apply_default_perms(params, is_directory, pace, S_IRGRP);
1373                         got_grp = True;
1374
1375                 } else if (pace->type == SMB_ACL_OTHER) {
1376
1377                         /*
1378                          * Ensure create mask/force create mode is respected on set.
1379                          */
1380
1381                         if (setting_acl)
1382                                 apply_default_perms(params, is_directory, pace, S_IROTH);
1383                         got_other = True;
1384                         pace_other = pace;
1385                 }
1386         }
1387
1388         if (!got_user) {
1389                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1390                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1391                         return False;
1392                 }
1393
1394                 ZERO_STRUCTP(pace);
1395                 pace->type = SMB_ACL_USER_OBJ;
1396                 pace->owner_type = UID_ACE;
1397                 pace->unix_ug.uid = pst->st_ex_uid;
1398                 pace->trustee = *pfile_owner_sid;
1399                 pace->attr = ALLOW_ACE;
1400
1401                 if (setting_acl) {
1402                         /* See if the owning user is in any of the other groups in
1403                            the ACE. If so, OR in the permissions from that group. */
1404
1405                         bool group_matched = False;
1406                         canon_ace *pace_iter;
1407
1408                         for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1409                                 if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1410                                         if (uid_entry_in_group(pace, pace_iter)) {
1411                                                 pace->perms |= pace_iter->perms;
1412                                                 group_matched = True;
1413                                         }
1414                                 }
1415                         }
1416
1417                         /* If we only got an "everyone" perm, just use that. */
1418                         if (!group_matched) {
1419                                 if (got_other)
1420                                         pace->perms = pace_other->perms;
1421                                 else
1422                                         pace->perms = 0;
1423                         }
1424
1425                         apply_default_perms(params, is_directory, pace, S_IRUSR);
1426                 } else {
1427                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1428                 }
1429
1430                 DLIST_ADD(*pp_ace, pace);
1431         }
1432
1433         if (!got_grp) {
1434                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1435                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1436                         return False;
1437                 }
1438
1439                 ZERO_STRUCTP(pace);
1440                 pace->type = SMB_ACL_GROUP_OBJ;
1441                 pace->owner_type = GID_ACE;
1442                 pace->unix_ug.uid = pst->st_ex_gid;
1443                 pace->trustee = *pfile_grp_sid;
1444                 pace->attr = ALLOW_ACE;
1445                 if (setting_acl) {
1446                         /* If we only got an "everyone" perm, just use that. */
1447                         if (got_other)
1448                                 pace->perms = pace_other->perms;
1449                         else
1450                                 pace->perms = 0;
1451                         apply_default_perms(params, is_directory, pace, S_IRGRP);
1452                 } else {
1453                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1454                 }
1455
1456                 DLIST_ADD(*pp_ace, pace);
1457         }
1458
1459         if (!got_other) {
1460                 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1461                         DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1462                         return False;
1463                 }
1464
1465                 ZERO_STRUCTP(pace);
1466                 pace->type = SMB_ACL_OTHER;
1467                 pace->owner_type = WORLD_ACE;
1468                 pace->unix_ug.world = -1;
1469                 pace->trustee = global_sid_World;
1470                 pace->attr = ALLOW_ACE;
1471                 if (setting_acl) {
1472                         pace->perms = 0;
1473                         apply_default_perms(params, is_directory, pace, S_IROTH);
1474                 } else
1475                         pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1476
1477                 DLIST_ADD(*pp_ace, pace);
1478         }
1479
1480         return True;
1481 }
1482
1483 /****************************************************************************
1484  Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1485  If it does not have them, check if there are any entries where the trustee is the
1486  file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1487 ****************************************************************************/
1488
1489 static void check_owning_objs(canon_ace *ace, DOM_SID *pfile_owner_sid, DOM_SID *pfile_grp_sid)
1490 {
1491         bool got_user_obj, got_group_obj;
1492         canon_ace *current_ace;
1493         int i, entries;
1494
1495         entries = count_canon_ace_list(ace);
1496         got_user_obj = False;
1497         got_group_obj = False;
1498
1499         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1500                 if (current_ace->type == SMB_ACL_USER_OBJ)
1501                         got_user_obj = True;
1502                 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1503                         got_group_obj = True;
1504         }
1505         if (got_user_obj && got_group_obj) {
1506                 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1507                 return;
1508         }
1509
1510         for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1511                 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1512                                 sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1513                         current_ace->type = SMB_ACL_USER_OBJ;
1514                         got_user_obj = True;
1515                 }
1516                 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1517                                 sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1518                         current_ace->type = SMB_ACL_GROUP_OBJ;
1519                         got_group_obj = True;
1520                 }
1521         }
1522         if (!got_user_obj)
1523                 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1524         if (!got_group_obj)
1525                 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1526 }
1527
1528 /****************************************************************************
1529  Unpack a SEC_DESC into two canonical ace lists.
1530 ****************************************************************************/
1531
1532 static bool create_canon_ace_lists(files_struct *fsp,
1533                                         const SMB_STRUCT_STAT *pst,
1534                                         DOM_SID *pfile_owner_sid,
1535                                         DOM_SID *pfile_grp_sid,
1536                                         canon_ace **ppfile_ace,
1537                                         canon_ace **ppdir_ace,
1538                                         const SEC_ACL *dacl)
1539 {
1540         bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1541         canon_ace *file_ace = NULL;
1542         canon_ace *dir_ace = NULL;
1543         canon_ace *current_ace = NULL;
1544         bool got_dir_allow = False;
1545         bool got_file_allow = False;
1546         int i, j;
1547
1548         *ppfile_ace = NULL;
1549         *ppdir_ace = NULL;
1550
1551         /*
1552          * Convert the incoming ACL into a more regular form.
1553          */
1554
1555         for(i = 0; i < dacl->num_aces; i++) {
1556                 SEC_ACE *psa = &dacl->aces[i];
1557
1558                 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1559                         DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1560                         return False;
1561                 }
1562
1563                 if (nt4_compatible_acls()) {
1564                         /*
1565                          * The security mask may be UNIX_ACCESS_NONE which should map into
1566                          * no permissions (we overload the WRITE_OWNER bit for this) or it
1567                          * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1568                          * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1569                          */
1570
1571                         /*
1572                          * Convert GENERIC bits to specific bits.
1573                          */
1574
1575                         se_map_generic(&psa->access_mask, &file_generic_mapping);
1576
1577                         psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1578
1579                         if(psa->access_mask != UNIX_ACCESS_NONE)
1580                                 psa->access_mask &= ~UNIX_ACCESS_NONE;
1581                 }
1582         }
1583
1584         /*
1585          * Deal with the fact that NT 4.x re-writes the canonical format
1586          * that we return for default ACLs. If a directory ACE is identical
1587          * to a inherited directory ACE then NT changes the bits so that the
1588          * first ACE is set to OI|IO and the second ACE for this SID is set
1589          * to CI. We need to repair this. JRA.
1590          */
1591
1592         for(i = 0; i < dacl->num_aces; i++) {
1593                 SEC_ACE *psa1 = &dacl->aces[i];
1594
1595                 for (j = i + 1; j < dacl->num_aces; j++) {
1596                         SEC_ACE *psa2 = &dacl->aces[j];
1597
1598                         if (psa1->access_mask != psa2->access_mask)
1599                                 continue;
1600
1601                         if (!sid_equal(&psa1->trustee, &psa2->trustee))
1602                                 continue;
1603
1604                         /*
1605                          * Ok - permission bits and SIDs are equal.
1606                          * Check if flags were re-written.
1607                          */
1608
1609                         if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1610
1611                                 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1612                                 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1613
1614                         } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1615
1616                                 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1617                                 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1618
1619                         }
1620                 }
1621         }
1622
1623         for(i = 0; i < dacl->num_aces; i++) {
1624                 SEC_ACE *psa = &dacl->aces[i];
1625
1626                 /*
1627                  * Create a cannon_ace entry representing this NT DACL ACE.
1628                  */
1629
1630                 if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1631                         free_canon_ace_list(file_ace);
1632                         free_canon_ace_list(dir_ace);
1633                         DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1634                         return False;
1635                 }
1636
1637                 ZERO_STRUCTP(current_ace);
1638
1639                 sid_copy(&current_ace->trustee, &psa->trustee);
1640
1641                 /*
1642                  * Try and work out if the SID is a user or group
1643                  * as we need to flag these differently for POSIX.
1644                  * Note what kind of a POSIX ACL this should map to.
1645                  */
1646
1647                 if( sid_equal(&current_ace->trustee, &global_sid_World)) {
1648                         current_ace->owner_type = WORLD_ACE;
1649                         current_ace->unix_ug.world = -1;
1650                         current_ace->type = SMB_ACL_OTHER;
1651                 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1652                         current_ace->owner_type = UID_ACE;
1653                         current_ace->unix_ug.uid = pst->st_ex_uid;
1654                         current_ace->type = SMB_ACL_USER_OBJ;
1655
1656                         /*
1657                          * The Creator Owner entry only specifies inheritable permissions,
1658                          * never access permissions. WinNT doesn't always set the ACE to
1659                          * INHERIT_ONLY, though.
1660                          */
1661
1662                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1663
1664                 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1665                         current_ace->owner_type = GID_ACE;
1666                         current_ace->unix_ug.gid = pst->st_ex_gid;
1667                         current_ace->type = SMB_ACL_GROUP_OBJ;
1668
1669                         /*
1670                          * The Creator Group entry only specifies inheritable permissions,
1671                          * never access permissions. WinNT doesn't always set the ACE to
1672                          * INHERIT_ONLY, though.
1673                          */
1674                         psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1675
1676                 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1677                         current_ace->owner_type = UID_ACE;
1678                         /* If it's the owning user, this is a user_obj, not
1679                          * a user. */
1680                         if (current_ace->unix_ug.uid == pst->st_ex_uid) {
1681                                 current_ace->type = SMB_ACL_USER_OBJ;
1682                         } else {
1683                                 current_ace->type = SMB_ACL_USER;
1684                         }
1685                 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1686                         current_ace->owner_type = GID_ACE;
1687                         /* If it's the primary group, this is a group_obj, not
1688                          * a group. */
1689                         if (current_ace->unix_ug.gid == pst->st_ex_gid) {
1690                                 current_ace->type = SMB_ACL_GROUP_OBJ;
1691                         } else {
1692                                 current_ace->type = SMB_ACL_GROUP;
1693                         }
1694                 } else {
1695                         /*
1696                          * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1697                          */
1698
1699                         if (non_mappable_sid(&psa->trustee)) {
1700                                 DEBUG(10, ("create_canon_ace_lists: ignoring "
1701                                            "non-mappable SID %s\n",
1702                                            sid_string_dbg(&psa->trustee)));
1703                                 SAFE_FREE(current_ace);
1704                                 continue;
1705                         }
1706
1707                         if (lp_force_unknown_acl_user(SNUM(fsp->conn))) {
1708                                 DEBUG(10, ("create_canon_ace_lists: ignoring "
1709                                         "unknown or foreign SID %s\n",
1710                                         sid_string_dbg(&psa->trustee)));
1711                                         SAFE_FREE(current_ace);
1712                                 continue;
1713                         }
1714
1715                         free_canon_ace_list(file_ace);
1716                         free_canon_ace_list(dir_ace);
1717                         DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1718                                   "%s to uid or gid.\n",
1719                                   sid_string_dbg(&current_ace->trustee)));
1720                         SAFE_FREE(current_ace);
1721                         return False;
1722                 }
1723
1724                 /*
1725                  * Map the given NT permissions into a UNIX mode_t containing only
1726                  * S_I(R|W|X)USR bits.
1727                  */
1728
1729                 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1730                 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1731
1732                 /* Store the ace_flag. */
1733                 current_ace->ace_flags = psa->flags;
1734
1735                 /*
1736                  * Now add the created ace to either the file list, the directory
1737                  * list, or both. We *MUST* preserve the order here (hence we use
1738                  * DLIST_ADD_END) as NT ACLs are order dependent.
1739                  */
1740
1741                 if (fsp->is_directory) {
1742
1743                         /*
1744                          * We can only add to the default POSIX ACE list if the ACE is
1745                          * designed to be inherited by both files and directories.
1746                          */
1747
1748                         if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1749                                 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1750
1751                                 canon_ace *current_dir_ace = current_ace;
1752                                 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1753
1754                                 /*
1755                                  * Note if this was an allow ace. We can't process
1756                                  * any further deny ace's after this.
1757                                  */
1758
1759                                 if (current_ace->attr == ALLOW_ACE)
1760                                         got_dir_allow = True;
1761
1762                                 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1763                                         DEBUG(0,("create_canon_ace_lists: "
1764                                                  "malformed ACL in "
1765                                                  "inheritable ACL! Deny entry "
1766                                                  "after Allow entry. Failing "
1767                                                  "to set on file %s.\n",
1768                                                  fsp_str_dbg(fsp)));
1769                                         free_canon_ace_list(file_ace);
1770                                         free_canon_ace_list(dir_ace);
1771                                         return False;
1772                                 }
1773
1774                                 if( DEBUGLVL( 10 )) {
1775                                         dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1776                                         print_canon_ace( current_ace, 0);
1777                                 }
1778
1779                                 /*
1780                                  * If this is not an inherit only ACE we need to add a duplicate
1781                                  * to the file acl.
1782                                  */
1783
1784                                 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1785                                         canon_ace *dup_ace = dup_canon_ace(current_ace);
1786
1787                                         if (!dup_ace) {
1788                                                 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1789                                                 free_canon_ace_list(file_ace);
1790                                                 free_canon_ace_list(dir_ace);
1791                                                 return False;
1792                                         }
1793
1794                                         /*
1795                                          * We must not free current_ace here as its
1796                                          * pointer is now owned by the dir_ace list.
1797                                          */
1798                                         current_ace = dup_ace;
1799                                         /* We've essentially split this ace into two,
1800                                          * and added the ace with inheritance request
1801                                          * bits to the directory ACL. Drop those bits for
1802                                          * the ACE we're adding to the file list. */
1803                                         current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
1804                                                                 SEC_ACE_FLAG_CONTAINER_INHERIT|
1805                                                                 SEC_ACE_FLAG_INHERIT_ONLY);
1806                                 } else {
1807                                         /*
1808                                          * We must not free current_ace here as its
1809                                          * pointer is now owned by the dir_ace list.
1810                                          */
1811                                         current_ace = NULL;
1812                                 }
1813
1814                                 /*
1815                                  * current_ace is now either owned by file_ace
1816                                  * or is NULL. We can safely operate on current_dir_ace
1817                                  * to treat mapping for default acl entries differently
1818                                  * than access acl entries.
1819                                  */
1820
1821                                 if (current_dir_ace->owner_type == UID_ACE) {
1822                                         /*
1823                                          * We already decided above this is a uid,
1824                                          * for default acls ace's only CREATOR_OWNER
1825                                          * maps to ACL_USER_OBJ. All other uid
1826                                          * ace's are ACL_USER.
1827                                          */
1828                                         if (sid_equal(&current_dir_ace->trustee,
1829                                                         &global_sid_Creator_Owner)) {
1830                                                 current_dir_ace->type = SMB_ACL_USER_OBJ;
1831                                         } else {
1832                                                 current_dir_ace->type = SMB_ACL_USER;
1833                                         }
1834                                 }
1835
1836                                 if (current_dir_ace->owner_type == GID_ACE) {
1837                                         /*
1838                                          * We already decided above this is a gid,
1839                                          * for default acls ace's only CREATOR_GROUP
1840                                          * maps to ACL_GROUP_OBJ. All other uid
1841                                          * ace's are ACL_GROUP.
1842                                          */
1843                                         if (sid_equal(&current_dir_ace->trustee,
1844                                                         &global_sid_Creator_Group)) {
1845                                                 current_dir_ace->type = SMB_ACL_GROUP_OBJ;
1846                                         } else {
1847                                                 current_dir_ace->type = SMB_ACL_GROUP;
1848                                         }
1849                                 }
1850                         }
1851                 }
1852
1853                 /*
1854                  * Only add to the file ACL if not inherit only.
1855                  */
1856
1857                 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1858                         DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1859
1860                         /*
1861                          * Note if this was an allow ace. We can't process
1862                          * any further deny ace's after this.
1863                          */
1864
1865                         if (current_ace->attr == ALLOW_ACE)
1866                                 got_file_allow = True;
1867
1868                         if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1869                                 DEBUG(0,("create_canon_ace_lists: malformed "
1870                                          "ACL in file ACL ! Deny entry after "
1871                                          "Allow entry. Failing to set on file "
1872                                          "%s.\n", fsp_str_dbg(fsp)));
1873                                 free_canon_ace_list(file_ace);
1874                                 free_canon_ace_list(dir_ace);
1875                                 return False;
1876                         }
1877
1878                         if( DEBUGLVL( 10 )) {
1879                                 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1880                                 print_canon_ace( current_ace, 0);
1881                         }
1882                         all_aces_are_inherit_only = False;
1883                         /*
1884                          * We must not free current_ace here as its
1885                          * pointer is now owned by the file_ace list.
1886                          */
1887                         current_ace = NULL;
1888                 }
1889
1890                 /*
1891                  * Free if ACE was not added.
1892                  */
1893
1894                 SAFE_FREE(current_ace);
1895         }
1896
1897         if (fsp->is_directory && all_aces_are_inherit_only) {
1898                 /*
1899                  * Windows 2000 is doing one of these weird 'inherit acl'
1900                  * traverses to conserve NTFS ACL resources. Just pretend
1901                  * there was no DACL sent. JRA.
1902                  */
1903
1904                 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1905                 free_canon_ace_list(file_ace);
1906                 free_canon_ace_list(dir_ace);
1907                 file_ace = NULL;
1908                 dir_ace = NULL;
1909         } else {
1910                 /*
1911                  * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in each
1912                  * ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1913                  * entries can be converted to *_OBJ. Usually we will already have these
1914                  * entries in the Default ACL, and the Access ACL will not have them.
1915                  */
1916                 if (file_ace) {
1917                         check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1918                 }
1919                 if (dir_ace) {
1920                         check_owning_objs(dir_ace, pfile_owner_sid, pfile_grp_sid);
1921                 }
1922         }
1923
1924         *ppfile_ace = file_ace;
1925         *ppdir_ace = dir_ace;
1926
1927         return True;
1928 }
1929
1930 /****************************************************************************
1931  ASCII art time again... JRA :-).
1932
1933  We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1934  we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1935  entries). Secondly, the merge code has ensured that all duplicate SID entries for
1936  allow or deny have been merged, so the same SID can only appear once in the deny
1937  list or once in the allow list.
1938
1939  We then process as follows :
1940
1941  ---------------------------------------------------------------------------
1942  First pass - look for a Everyone DENY entry.
1943
1944  If it is deny all (rwx) trunate the list at this point.
1945  Else, walk the list from this point and use the deny permissions of this
1946  entry as a mask on all following allow entries. Finally, delete
1947  the Everyone DENY entry (we have applied it to everything possible).
1948
1949  In addition, in this pass we remove any DENY entries that have
1950  no permissions (ie. they are a DENY nothing).
1951  ---------------------------------------------------------------------------
1952  Second pass - only deal with deny user entries.
1953
1954  DENY user1 (perms XXX)
1955
1956  new_perms = 0
1957  for all following allow group entries where user1 is in group
1958         new_perms |= group_perms;
1959
1960  user1 entry perms = new_perms & ~ XXX;
1961
1962  Convert the deny entry to an allow entry with the new perms and
1963  push to the end of the list. Note if the user was in no groups
1964  this maps to a specific allow nothing entry for this user.
1965
1966  The common case from the NT ACL choser (userX deny all) is
1967  optimised so we don't do the group lookup - we just map to
1968  an allow nothing entry.
1969
1970  What we're doing here is inferring the allow permissions the
1971  person setting the ACE on user1 wanted by looking at the allow
1972  permissions on the groups the user is currently in. This will
1973  be a snapshot, depending on group membership but is the best
1974  we can do and has the advantage of failing closed rather than
1975  open.
1976  ---------------------------------------------------------------------------
1977  Third pass - only deal with deny group entries.
1978
1979  DENY group1 (perms XXX)
1980
1981  for all following allow user entries where user is in group1
1982    user entry perms = user entry perms & ~ XXX;
1983
1984  If there is a group Everyone allow entry with permissions YYY,
1985  convert the group1 entry to an allow entry and modify its
1986  permissions to be :
1987
1988  new_perms = YYY & ~ XXX
1989
1990  and push to the end of the list.
1991
1992  If there is no group Everyone allow entry then convert the
1993  group1 entry to a allow nothing entry and push to the end of the list.
1994
1995  Note that the common case from the NT ACL choser (groupX deny all)
1996  cannot be optimised here as we need to modify user entries who are
1997  in the group to change them to a deny all also.
1998
1999  What we're doing here is modifying the allow permissions of
2000  user entries (which are more specific in POSIX ACLs) to mask
2001  out the explicit deny set on the group they are in. This will
2002  be a snapshot depending on current group membership but is the
2003  best we can do and has the advantage of failing closed rather
2004  than open.
2005  ---------------------------------------------------------------------------
2006  Fourth pass - cope with cumulative permissions.
2007
2008  for all allow user entries, if there exists an allow group entry with
2009  more permissive permissions, and the user is in that group, rewrite the
2010  allow user permissions to contain both sets of permissions.
2011
2012  Currently the code for this is #ifdef'ed out as these semantics make
2013  no sense to me. JRA.
2014  ---------------------------------------------------------------------------
2015
2016  Note we *MUST* do the deny user pass first as this will convert deny user
2017  entries into allow user entries which can then be processed by the deny
2018  group pass.
2019
2020  The above algorithm took a *lot* of thinking about - hence this
2021  explaination :-). JRA.
2022 ****************************************************************************/
2023
2024 /****************************************************************************
2025  Process a canon_ace list entries. This is very complex code. We need
2026  to go through and remove the "deny" permissions from any allow entry that matches
2027  the id of this entry. We have already refused any NT ACL that wasn't in correct
2028  order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2029  we just remove it (to fail safe). We have already removed any duplicate ace
2030  entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2031  allow entries.
2032 ****************************************************************************/
2033
2034 static void process_deny_list( canon_ace **pp_ace_list )
2035 {
2036         canon_ace *ace_list = *pp_ace_list;
2037         canon_ace *curr_ace = NULL;
2038         canon_ace *curr_ace_next = NULL;
2039
2040         /* Pass 1 above - look for an Everyone, deny entry. */
2041
2042         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2043                 canon_ace *allow_ace_p;
2044
2045                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2046
2047                 if (curr_ace->attr != DENY_ACE)
2048                         continue;
2049
2050                 if (curr_ace->perms == (mode_t)0) {
2051
2052                         /* Deny nothing entry - delete. */
2053
2054                         DLIST_REMOVE(ace_list, curr_ace);
2055                         continue;
2056                 }
2057
2058                 if (!sid_equal(&curr_ace->trustee, &global_sid_World))
2059                         continue;
2060
2061                 /* JRATEST - assert. */
2062                 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2063
2064                 if (curr_ace->perms == ALL_ACE_PERMS) {
2065
2066                         /*
2067                          * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2068                          * list at this point including this entry.
2069                          */
2070
2071                         canon_ace *prev_entry = curr_ace->prev;
2072
2073                         free_canon_ace_list( curr_ace );
2074                         if (prev_entry)
2075                                 prev_entry->next = NULL;
2076                         else {
2077                                 /* We deleted the entire list. */
2078                                 ace_list = NULL;
2079                         }
2080                         break;
2081                 }
2082
2083                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2084
2085                         /*
2086                          * Only mask off allow entries.
2087                          */
2088
2089                         if (allow_ace_p->attr != ALLOW_ACE)
2090                                 continue;
2091
2092                         allow_ace_p->perms &= ~curr_ace->perms;
2093                 }
2094
2095                 /*
2096                  * Now it's been applied, remove it.
2097                  */
2098
2099                 DLIST_REMOVE(ace_list, curr_ace);
2100         }
2101
2102         /* Pass 2 above - deal with deny user entries. */
2103
2104         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2105                 mode_t new_perms = (mode_t)0;
2106                 canon_ace *allow_ace_p;
2107
2108                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2109
2110                 if (curr_ace->attr != DENY_ACE)
2111                         continue;
2112
2113                 if (curr_ace->owner_type != UID_ACE)
2114                         continue;
2115
2116                 if (curr_ace->perms == ALL_ACE_PERMS) {
2117
2118                         /*
2119                          * Optimisation - this is a deny everything to this user.
2120                          * Convert to an allow nothing and push to the end of the list.
2121                          */
2122
2123                         curr_ace->attr = ALLOW_ACE;
2124                         curr_ace->perms = (mode_t)0;
2125                         DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2126                         continue;
2127                 }
2128
2129                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2130
2131                         if (allow_ace_p->attr != ALLOW_ACE)
2132                                 continue;
2133
2134                         /* We process GID_ACE and WORLD_ACE entries only. */
2135
2136                         if (allow_ace_p->owner_type == UID_ACE)
2137                                 continue;
2138
2139                         if (uid_entry_in_group( curr_ace, allow_ace_p))
2140                                 new_perms |= allow_ace_p->perms;
2141                 }
2142
2143                 /*
2144                  * Convert to a allow entry, modify the perms and push to the end
2145                  * of the list.
2146                  */
2147
2148                 curr_ace->attr = ALLOW_ACE;
2149                 curr_ace->perms = (new_perms & ~curr_ace->perms);
2150                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2151         }
2152
2153         /* Pass 3 above - deal with deny group entries. */
2154
2155         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2156                 canon_ace *allow_ace_p;
2157                 canon_ace *allow_everyone_p = NULL;
2158
2159                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2160
2161                 if (curr_ace->attr != DENY_ACE)
2162                         continue;
2163
2164                 if (curr_ace->owner_type != GID_ACE)
2165                         continue;
2166
2167                 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2168
2169                         if (allow_ace_p->attr != ALLOW_ACE)
2170                                 continue;
2171
2172                         /* Store a pointer to the Everyone allow, if it exists. */
2173                         if (allow_ace_p->owner_type == WORLD_ACE)
2174                                 allow_everyone_p = allow_ace_p;
2175
2176                         /* We process UID_ACE entries only. */
2177
2178                         if (allow_ace_p->owner_type != UID_ACE)
2179                                 continue;
2180
2181                         /* Mask off the deny group perms. */
2182
2183                         if (uid_entry_in_group( allow_ace_p, curr_ace))
2184                                 allow_ace_p->perms &= ~curr_ace->perms;
2185                 }
2186
2187                 /*
2188                  * Convert the deny to an allow with the correct perms and
2189                  * push to the end of the list.
2190                  */
2191
2192                 curr_ace->attr = ALLOW_ACE;
2193                 if (allow_everyone_p)
2194                         curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2195                 else
2196                         curr_ace->perms = (mode_t)0;
2197                 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2198         }
2199
2200         /* Doing this fourth pass allows Windows semantics to be layered
2201          * on top of POSIX semantics. I'm not sure if this is desirable.
2202          * For example, in W2K ACLs there is no way to say, "Group X no
2203          * access, user Y full access" if user Y is a member of group X.
2204          * This seems completely broken semantics to me.... JRA.
2205          */
2206
2207 #if 0
2208         /* Pass 4 above - deal with allow entries. */
2209
2210         for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2211                 canon_ace *allow_ace_p;
2212
2213                 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2214
2215                 if (curr_ace->attr != ALLOW_ACE)
2216                         continue;
2217
2218                 if (curr_ace->owner_type != UID_ACE)
2219                         continue;
2220
2221                 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2222
2223                         if (allow_ace_p->attr != ALLOW_ACE)
2224                                 continue;
2225
2226                         /* We process GID_ACE entries only. */
2227
2228                         if (allow_ace_p->owner_type != GID_ACE)
2229                                 continue;
2230
2231                         /* OR in the group perms. */
2232
2233                         if (uid_entry_in_group( curr_ace, allow_ace_p))
2234                                 curr_ace->perms |= allow_ace_p->perms;
2235                 }
2236         }
2237 #endif
2238
2239         *pp_ace_list = ace_list;
2240 }
2241
2242 /****************************************************************************
2243  Create a default mode that will be used if a security descriptor entry has
2244  no user/group/world entries.
2245 ****************************************************************************/
2246
2247 static mode_t create_default_mode(files_struct *fsp, bool interitable_mode)
2248 {
2249         int snum = SNUM(fsp->conn);
2250         mode_t and_bits = (mode_t)0;
2251         mode_t or_bits = (mode_t)0;
2252         mode_t mode;
2253
2254         if (interitable_mode) {
2255                 mode = unix_mode(fsp->conn, FILE_ATTRIBUTE_ARCHIVE,
2256                                  fsp->fsp_name, NULL);
2257         } else {
2258                 mode = S_IRUSR;
2259         }
2260
2261         if (fsp->is_directory)
2262                 mode |= (S_IWUSR|S_IXUSR);
2263
2264         /*
2265          * Now AND with the create mode/directory mode bits then OR with the
2266          * force create mode/force directory mode bits.
2267          */
2268
2269         if (fsp->is_directory) {
2270                 and_bits = lp_dir_security_mask(snum);
2271                 or_bits = lp_force_dir_security_mode(snum);
2272         } else {
2273                 and_bits = lp_security_mask(snum);
2274                 or_bits = lp_force_security_mode(snum);
2275         }
2276
2277         return ((mode & and_bits)|or_bits);
2278 }
2279
2280 /****************************************************************************
2281  Unpack a SEC_DESC into two canonical ace lists. We don't depend on this
2282  succeeding.
2283 ****************************************************************************/
2284
2285 static bool unpack_canon_ace(files_struct *fsp,
2286                                 const SMB_STRUCT_STAT *pst,
2287                                 DOM_SID *pfile_owner_sid,
2288                                 DOM_SID *pfile_grp_sid,
2289                                 canon_ace **ppfile_ace,
2290                                 canon_ace **ppdir_ace,
2291                                 uint32 security_info_sent,
2292                                 const SEC_DESC *psd)
2293 {
2294         SMB_STRUCT_STAT st;
2295         canon_ace *file_ace = NULL;
2296         canon_ace *dir_ace = NULL;
2297
2298         *ppfile_ace = NULL;
2299         *ppdir_ace = NULL;
2300
2301         if(security_info_sent == 0) {
2302                 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2303                 return False;
2304         }
2305
2306         /*
2307          * If no DACL then this is a chown only security descriptor.
2308          */
2309
2310         if(!(security_info_sent & DACL_SECURITY_INFORMATION) || !psd->dacl)
2311                 return True;
2312
2313         /*
2314          * Now go through the DACL and create the canon_ace lists.
2315          */
2316
2317         if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2318                                                                 &file_ace, &dir_ace, psd->dacl))
2319                 return False;
2320
2321         if ((file_ace == NULL) && (dir_ace == NULL)) {
2322                 /* W2K traverse DACL set - ignore. */
2323                 return True;
2324         }
2325
2326         /*
2327          * Go through the canon_ace list and merge entries
2328          * belonging to identical users of identical allow or deny type.
2329          * We can do this as all deny entries come first, followed by
2330          * all allow entries (we have mandated this before accepting this acl).
2331          */
2332
2333         print_canon_ace_list( "file ace - before merge", file_ace);
2334         merge_aces( &file_ace, false);
2335
2336         print_canon_ace_list( "dir ace - before merge", dir_ace);
2337         merge_aces( &dir_ace, true);
2338
2339         /*
2340          * NT ACLs are order dependent. Go through the acl lists and
2341          * process DENY entries by masking the allow entries.
2342          */
2343
2344         print_canon_ace_list( "file ace - before deny", file_ace);
2345         process_deny_list( &file_ace);
2346
2347         print_canon_ace_list( "dir ace - before deny", dir_ace);
2348         process_deny_list( &dir_ace);
2349
2350         /*
2351          * A well formed POSIX file or default ACL has at least 3 entries, a
2352          * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2353          * and optionally a mask entry. Ensure this is the case.
2354          */
2355
2356         print_canon_ace_list( "file ace - before valid", file_ace);
2357
2358         st = *pst;
2359
2360         /*
2361          * A default 3 element mode entry for a file should be r-- --- ---.
2362          * A default 3 element mode entry for a directory should be rwx --- ---.
2363          */
2364
2365         st.st_ex_mode = create_default_mode(fsp, False);
2366
2367         if (!ensure_canon_entry_valid(&file_ace, fsp->conn->params,
2368                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, &st, True)) {
2369                 free_canon_ace_list(file_ace);
2370                 free_canon_ace_list(dir_ace);
2371                 return False;
2372         }
2373
2374         print_canon_ace_list( "dir ace - before valid", dir_ace);
2375
2376         /*
2377          * A default inheritable 3 element mode entry for a directory should be the
2378          * mode Samba will use to create a file within. Ensure user rwx bits are set if
2379          * it's a directory.
2380          */
2381
2382         st.st_ex_mode = create_default_mode(fsp, True);
2383
2384         if (dir_ace && !ensure_canon_entry_valid(&dir_ace, fsp->conn->params,
2385                         fsp->is_directory, pfile_owner_sid, pfile_grp_sid, &st, True)) {
2386                 free_canon_ace_list(file_ace);
2387                 free_canon_ace_list(dir_ace);
2388                 return False;
2389         }
2390
2391         print_canon_ace_list( "file ace - return", file_ace);
2392         print_canon_ace_list( "dir ace - return", dir_ace);
2393
2394         *ppfile_ace = file_ace;
2395         *ppdir_ace = dir_ace;
2396         return True;
2397
2398 }
2399
2400 /******************************************************************************
2401  When returning permissions, try and fit NT display
2402  semantics if possible. Note the the canon_entries here must have been malloced.
2403  The list format should be - first entry = owner, followed by group and other user
2404  entries, last entry = other.
2405
2406  Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2407  are not ordered, and match on the most specific entry rather than walking a list,
2408  then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2409
2410  Entry 0: owner : deny all except read and write.
2411  Entry 1: owner : allow read and write.
2412  Entry 2: group : deny all except read.
2413  Entry 3: group : allow read.
2414  Entry 4: Everyone : allow read.
2415
2416  But NT cannot display this in their ACL editor !
2417 ********************************************************************************/
2418
2419 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2420 {
2421         canon_ace *l_head = *pp_list_head;
2422         canon_ace *owner_ace = NULL;
2423         canon_ace *other_ace = NULL;
2424         canon_ace *ace = NULL;
2425
2426         for (ace = l_head; ace; ace = ace->next) {
2427                 if (ace->type == SMB_ACL_USER_OBJ)
2428                         owner_ace = ace;
2429                 else if (ace->type == SMB_ACL_OTHER) {
2430                         /* Last ace - this is "other" */
2431                         other_ace = ace;
2432                 }
2433         }
2434
2435         if (!owner_ace || !other_ace) {
2436                 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2437                         filename ));
2438                 return;
2439         }
2440
2441         /*
2442          * The POSIX algorithm applies to owner first, and other last,
2443          * so ensure they are arranged in this order.
2444          */
2445
2446         if (owner_ace) {
2447                 DLIST_PROMOTE(l_head, owner_ace);
2448         }
2449
2450         if (other_ace) {
2451                 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2452         }
2453
2454         /* We have probably changed the head of the list. */
2455
2456         *pp_list_head = l_head;
2457 }
2458
2459 /****************************************************************************
2460  Create a linked list of canonical ACE entries.
2461 ****************************************************************************/
2462
2463 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2464                                    const char *fname, SMB_ACL_T posix_acl,
2465                                    const SMB_STRUCT_STAT *psbuf,
2466                                    const DOM_SID *powner, const DOM_SID *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2467 {
2468         mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2469         canon_ace *l_head = NULL;
2470         canon_ace *ace = NULL;
2471         canon_ace *next_ace = NULL;
2472         int entry_id = SMB_ACL_FIRST_ENTRY;
2473         SMB_ACL_ENTRY_T entry;
2474         size_t ace_count;
2475
2476         while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2477                 SMB_ACL_TAG_T tagtype;
2478                 SMB_ACL_PERMSET_T permset;
2479                 DOM_SID sid;
2480                 posix_id unix_ug;
2481                 enum ace_owner owner_type;
2482
2483                 entry_id = SMB_ACL_NEXT_ENTRY;
2484
2485                 /* Is this a MASK entry ? */
2486                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2487                         continue;
2488
2489                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2490                         continue;
2491
2492                 /* Decide which SID to use based on the ACL type. */
2493                 switch(tagtype) {
2494                         case SMB_ACL_USER_OBJ:
2495                                 /* Get the SID from the owner. */
2496                                 sid_copy(&sid, powner);
2497                                 unix_ug.uid = psbuf->st_ex_uid;
2498                                 owner_type = UID_ACE;
2499                                 break;
2500                         case SMB_ACL_USER:
2501                                 {
2502                                         uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2503                                         if (puid == NULL) {
2504                                                 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2505                                                 continue;
2506                                         }
2507                                         uid_to_sid( &sid, *puid);
2508                                         unix_ug.uid = *puid;
2509                                         owner_type = UID_ACE;
2510                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2511                                         break;
2512                                 }
2513                         case SMB_ACL_GROUP_OBJ:
2514                                 /* Get the SID from the owning group. */
2515                                 sid_copy(&sid, pgroup);
2516                                 unix_ug.gid = psbuf->st_ex_gid;
2517                                 owner_type = GID_ACE;
2518                                 break;
2519                         case SMB_ACL_GROUP:
2520                                 {
2521                                         gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2522                                         if (pgid == NULL) {
2523                                                 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2524                                                 continue;
2525                                         }
2526                                         gid_to_sid( &sid, *pgid);
2527                                         unix_ug.gid = *pgid;
2528                                         owner_type = GID_ACE;
2529                                         SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2530                                         break;
2531                                 }
2532                         case SMB_ACL_MASK:
2533                                 acl_mask = convert_permset_to_mode_t(conn, permset);
2534                                 continue; /* Don't count the mask as an entry. */
2535                         case SMB_ACL_OTHER:
2536                                 /* Use the Everyone SID */
2537                                 sid = global_sid_World;
2538                                 unix_ug.world = -1;
2539                                 owner_type = WORLD_ACE;
2540                                 break;
2541                         default:
2542                                 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2543                                 continue;
2544                 }
2545
2546                 /*
2547                  * Add this entry to the list.
2548                  */
2549
2550                 if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2551                         goto fail;
2552
2553                 ZERO_STRUCTP(ace);
2554                 ace->type = tagtype;
2555                 ace->perms = convert_permset_to_mode_t(conn, permset);
2556                 ace->attr = ALLOW_ACE;
2557                 ace->trustee = sid;
2558                 ace->unix_ug = unix_ug;
2559                 ace->owner_type = owner_type;
2560                 ace->ace_flags = get_pai_flags(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2561
2562                 DLIST_ADD(l_head, ace);
2563         }
2564
2565         /*
2566          * This next call will ensure we have at least a user/group/world set.
2567          */
2568
2569         if (!ensure_canon_entry_valid(&l_head, conn->params,
2570                                       S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2571                                       psbuf, False))
2572                 goto fail;
2573
2574         /*
2575          * Now go through the list, masking the permissions with the
2576          * acl_mask. Ensure all DENY Entries are at the start of the list.
2577          */
2578
2579         DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2580
2581         for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2582                 next_ace = ace->next;
2583
2584                 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2585                 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2586                         ace->perms &= acl_mask;
2587
2588                 if (ace->perms == 0) {
2589                         DLIST_PROMOTE(l_head, ace);
2590                 }
2591
2592                 if( DEBUGLVL( 10 ) ) {
2593                         print_canon_ace(ace, ace_count);
2594                 }
2595         }
2596
2597         arrange_posix_perms(fname,&l_head );
2598
2599         print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2600
2601         return l_head;
2602
2603   fail:
2604
2605         free_canon_ace_list(l_head);
2606         return NULL;
2607 }
2608
2609 /****************************************************************************
2610  Check if the current user group list contains a given group.
2611 ****************************************************************************/
2612
2613 bool current_user_in_group(gid_t gid)
2614 {
2615         int i;
2616
2617         for (i = 0; i < current_user.ut.ngroups; i++) {
2618                 if (current_user.ut.groups[i] == gid) {
2619                         return True;
2620                 }
2621         }
2622
2623         return False;
2624 }
2625
2626 /****************************************************************************
2627  Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2628 ****************************************************************************/
2629
2630 static bool acl_group_override(connection_struct *conn,
2631                                const struct smb_filename *smb_fname)
2632 {
2633         if ((errno != EPERM) && (errno != EACCES)) {
2634                 return false;
2635         }
2636
2637         /* file primary group == user primary or supplementary group */
2638         if (lp_acl_group_control(SNUM(conn)) &&
2639             current_user_in_group(smb_fname->st.st_ex_gid)) {
2640                 return true;
2641         }
2642
2643         /* user has writeable permission */
2644         if (lp_dos_filemode(SNUM(conn)) &&
2645             can_write_to_file(conn, smb_fname)) {
2646                 return true;
2647         }
2648
2649         return false;
2650 }
2651
2652 /****************************************************************************
2653  Attempt to apply an ACL to a file or directory.
2654 ****************************************************************************/
2655
2656 static bool set_canon_ace_list(files_struct *fsp,
2657                                 canon_ace *the_ace,
2658                                 bool default_ace,
2659                                 const SMB_STRUCT_STAT *psbuf,
2660                                 bool *pacl_set_support)
2661 {
2662         connection_struct *conn = fsp->conn;
2663         bool ret = False;
2664         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2665         canon_ace *p_ace;
2666         int i;
2667         SMB_ACL_ENTRY_T mask_entry;
2668         bool got_mask_entry = False;
2669         SMB_ACL_PERMSET_T mask_permset;
2670         SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2671         bool needs_mask = False;
2672         mode_t mask_perms = 0;
2673
2674         /* Use the psbuf that was passed in. */
2675         if (psbuf != &fsp->fsp_name->st) {
2676                 fsp->fsp_name->st = *psbuf;
2677         }
2678
2679 #if defined(POSIX_ACL_NEEDS_MASK)
2680         /* HP-UX always wants to have a mask (called "class" there). */
2681         needs_mask = True;
2682 #endif
2683
2684         if (the_acl == NULL) {
2685
2686                 if (!no_acl_syscall_error(errno)) {
2687                         /*
2688                          * Only print this error message if we have some kind of ACL
2689                          * support that's not working. Otherwise we would always get this.
2690                          */
2691                         DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2692                                 default_ace ? "default" : "file", strerror(errno) ));
2693                 }
2694                 *pacl_set_support = False;
2695                 goto fail;
2696         }
2697
2698         if( DEBUGLVL( 10 )) {
2699                 dbgtext("set_canon_ace_list: setting ACL:\n");
2700                 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2701                         print_canon_ace( p_ace, i);
2702                 }
2703         }
2704
2705         for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2706                 SMB_ACL_ENTRY_T the_entry;
2707                 SMB_ACL_PERMSET_T the_permset;
2708
2709                 /*
2710                  * ACLs only "need" an ACL_MASK entry if there are any named user or
2711                  * named group entries. But if there is an ACL_MASK entry, it applies
2712                  * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2713                  * so that it doesn't deny (i.e., mask off) any permissions.
2714                  */
2715
2716                 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2717                         needs_mask = True;
2718                         mask_perms |= p_ace->perms;
2719                 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2720                         mask_perms |= p_ace->perms;
2721                 }
2722
2723                 /*
2724                  * Get the entry for this ACE.
2725                  */
2726
2727                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2728                         DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2729                                 i, strerror(errno) ));
2730                         goto fail;
2731                 }
2732
2733                 if (p_ace->type == SMB_ACL_MASK) {
2734                         mask_entry = the_entry;
2735                         got_mask_entry = True;
2736                 }
2737
2738                 /*
2739                  * Ok - we now know the ACL calls should be working, don't
2740                  * allow fallback to chmod.
2741                  */
2742
2743                 *pacl_set_support = True;
2744
2745                 /*
2746                  * Initialise the entry from the canon_ace.
2747                  */
2748
2749                 /*
2750                  * First tell the entry what type of ACE this is.
2751                  */
2752
2753                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2754                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2755                                 i, strerror(errno) ));
2756                         goto fail;
2757                 }
2758
2759                 /*
2760                  * Only set the qualifier (user or group id) if the entry is a user
2761                  * or group id ACE.
2762                  */
2763
2764                 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2765                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2766                                 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2767                                         i, strerror(errno) ));
2768                                 goto fail;
2769                         }
2770                 }
2771
2772                 /*
2773                  * Convert the mode_t perms in the canon_ace to a POSIX permset.
2774                  */
2775
2776                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2777                         DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2778                                 i, strerror(errno) ));
2779                         goto fail;
2780                 }
2781
2782                 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2783                         DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2784                                 (unsigned int)p_ace->perms, i, strerror(errno) ));
2785                         goto fail;
2786                 }
2787
2788                 /*
2789                  * ..and apply them to the entry.
2790                  */
2791
2792                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2793                         DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2794                                 i, strerror(errno) ));
2795                         goto fail;
2796                 }
2797
2798                 if( DEBUGLVL( 10 ))
2799                         print_canon_ace( p_ace, i);
2800
2801         }
2802
2803         if (needs_mask && !got_mask_entry) {
2804                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2805                         DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2806                         goto fail;
2807                 }
2808
2809                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2810                         DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2811                         goto fail;
2812                 }
2813
2814                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2815                         DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2816                         goto fail;
2817                 }
2818
2819                 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2820                         DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2821                         goto fail;
2822                 }
2823
2824                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2825                         DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2826                         goto fail;
2827                 }
2828         }
2829
2830         /*
2831          * Finally apply it to the file or directory.
2832          */
2833
2834         if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2835                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
2836                                              the_acl_type, the_acl) == -1) {
2837                         /*
2838                          * Some systems allow all the above calls and only fail with no ACL support
2839                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2840                          */
2841                         if (no_acl_syscall_error(errno)) {
2842                                 *pacl_set_support = False;
2843                         }
2844
2845                         if (acl_group_override(conn, fsp->fsp_name)) {
2846                                 int sret;
2847
2848                                 DEBUG(5,("set_canon_ace_list: acl group "
2849                                          "control on and current user in file "
2850                                          "%s primary group.\n",
2851                                          fsp_str_dbg(fsp)));
2852
2853                                 become_root();
2854                                 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
2855                                     fsp->fsp_name->base_name, the_acl_type,
2856                                     the_acl);
2857                                 unbecome_root();
2858                                 if (sret == 0) {
2859                                         ret = True;
2860                                 }
2861                         }
2862
2863                         if (ret == False) {
2864                                 DEBUG(2,("set_canon_ace_list: "
2865                                          "sys_acl_set_file type %s failed for "
2866                                          "file %s (%s).\n",
2867                                          the_acl_type == SMB_ACL_TYPE_DEFAULT ?
2868                                          "directory default" : "file",
2869                                          fsp_str_dbg(fsp), strerror(errno)));
2870                                 goto fail;
2871                         }
2872                 }
2873         } else {
2874                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2875                         /*
2876                          * Some systems allow all the above calls and only fail with no ACL support
2877                          * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2878                          */
2879                         if (no_acl_syscall_error(errno)) {
2880                                 *pacl_set_support = False;
2881                         }
2882
2883                         if (acl_group_override(conn, fsp->fsp_name)) {
2884                                 int sret;
2885
2886                                 DEBUG(5,("set_canon_ace_list: acl group "
2887                                          "control on and current user in file "
2888                                          "%s primary group.\n",
2889                                          fsp_str_dbg(fsp)));
2890
2891                                 become_root();
2892                                 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2893                                 unbecome_root();
2894                                 if (sret == 0) {
2895                                         ret = True;
2896                                 }
2897                         }
2898
2899                         if (ret == False) {
2900                                 DEBUG(2,("set_canon_ace_list: "
2901                                          "sys_acl_set_file failed for file %s "
2902                                          "(%s).\n",
2903                                          fsp_str_dbg(fsp), strerror(errno)));
2904                                 goto fail;
2905                         }
2906                 }
2907         }
2908
2909         ret = True;
2910
2911   fail:
2912
2913         if (the_acl != NULL) {
2914                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2915         }
2916
2917         return ret;
2918 }
2919
2920 /****************************************************************************
2921  Find a particular canon_ace entry.
2922 ****************************************************************************/
2923
2924 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2925 {
2926         while (list) {
2927                 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2928                                 (type == SMB_ACL_USER  && id && id->uid == list->unix_ug.uid) ||
2929                                 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2930                         break;
2931                 list = list->next;
2932         }
2933         return list;
2934 }
2935
2936 /****************************************************************************
2937
2938 ****************************************************************************/
2939
2940 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2941 {
2942         SMB_ACL_ENTRY_T entry;
2943
2944         if (!the_acl)
2945                 return NULL;
2946         if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2947                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2948                 return NULL;
2949         }
2950         return the_acl;
2951 }
2952
2953 /****************************************************************************
2954  Convert a canon_ace to a generic 3 element permission - if possible.
2955 ****************************************************************************/
2956
2957 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2958
2959 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
2960 {
2961         int snum = SNUM(fsp->conn);
2962         size_t ace_count = count_canon_ace_list(file_ace_list);
2963         canon_ace *ace_p;
2964         canon_ace *owner_ace = NULL;
2965         canon_ace *group_ace = NULL;
2966         canon_ace *other_ace = NULL;
2967         mode_t and_bits;
2968         mode_t or_bits;
2969
2970         if (ace_count != 3) {
2971                 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
2972                          "entries for file %s to convert to posix perms.\n",
2973                          fsp_str_dbg(fsp)));
2974                 return False;
2975         }
2976
2977         for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
2978                 if (ace_p->owner_type == UID_ACE)
2979                         owner_ace = ace_p;
2980                 else if (ace_p->owner_type == GID_ACE)
2981                         group_ace = ace_p;
2982                 else if (ace_p->owner_type == WORLD_ACE)
2983                         other_ace = ace_p;
2984         }
2985
2986         if (!owner_ace || !group_ace || !other_ace) {
2987                 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
2988                          "standard entries for file %s.\n", fsp_str_dbg(fsp)));
2989                 return False;
2990         }
2991
2992         *posix_perms = (mode_t)0;
2993
2994         *posix_perms |= owner_ace->perms;
2995         *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
2996         *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
2997         *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
2998         *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
2999         *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
3000         *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
3001
3002         /* The owner must have at least read access. */
3003
3004         *posix_perms |= S_IRUSR;
3005         if (fsp->is_directory)
3006                 *posix_perms |= (S_IWUSR|S_IXUSR);
3007
3008         /* If requested apply the masks. */
3009
3010         /* Get the initial bits to apply. */
3011
3012         if (fsp->is_directory) {
3013                 and_bits = lp_dir_security_mask(snum);
3014                 or_bits = lp_force_dir_security_mode(snum);
3015         } else {
3016                 and_bits = lp_security_mask(snum);
3017                 or_bits = lp_force_security_mode(snum);
3018         }
3019
3020         *posix_perms = (((*posix_perms) & and_bits)|or_bits);
3021
3022         DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
3023                   "to perm=0%o for file %s.\n", (int)owner_ace->perms,
3024                   (int)group_ace->perms, (int)other_ace->perms,
3025                   (int)*posix_perms, fsp_str_dbg(fsp)));
3026
3027         return True;
3028 }
3029
3030 /****************************************************************************
3031   Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
3032   a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
3033   with CI|OI set so it is inherited and also applies to the directory.
3034   Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
3035 ****************************************************************************/
3036
3037 static size_t merge_default_aces( SEC_ACE *nt_ace_list, size_t num_aces)
3038 {
3039         size_t i, j;
3040
3041         for (i = 0; i < num_aces; i++) {
3042                 for (j = i+1; j < num_aces; j++) {
3043                         uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3044                         uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3045                         bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3046                         bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3047
3048                         /* We know the lower number ACE's are file entries. */
3049                         if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3050                                 (nt_ace_list[i].size == nt_ace_list[j].size) &&
3051                                 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3052                                 sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3053                                 (i_inh == j_inh) &&
3054                                 (i_flags_ni == 0) &&
3055                                 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3056                                                   SEC_ACE_FLAG_CONTAINER_INHERIT|
3057                                                   SEC_ACE_FLAG_INHERIT_ONLY))) {
3058                                 /*
3059                                  * W2K wants to have access allowed zero access ACE's
3060                                  * at the end of the list. If the mask is zero, merge
3061                                  * the non-inherited ACE onto the inherited ACE.
3062                                  */
3063
3064                                 if (nt_ace_list[i].access_mask == 0) {
3065                                         nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3066                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3067                                         if (num_aces - i - 1 > 0)
3068                                                 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3069                                                                 sizeof(SEC_ACE));
3070
3071                                         DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3072                                                 (unsigned int)i, (unsigned int)j ));
3073                                 } else {
3074                                         /*
3075                                          * These are identical except for the flags.
3076                                          * Merge the inherited ACE onto the non-inherited ACE.
3077                                          */
3078
3079                                         nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3080                                                                 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3081                                         if (num_aces - j - 1 > 0)
3082                                                 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3083                                                                 sizeof(SEC_ACE));
3084
3085                                         DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3086                                                 (unsigned int)j, (unsigned int)i ));
3087                                 }
3088                                 num_aces--;
3089                                 break;
3090                         }
3091                 }
3092         }
3093
3094         return num_aces;
3095 }
3096
3097 /*
3098  * Add or Replace ACE entry.
3099  * In some cases we need to add a specific ACE for compatibility reasons.
3100  * When doing that we must make sure we are not actually creating a duplicate
3101  * entry. So we need to search whether an ACE entry already exist and eventually
3102  * replacce the access mask, or add a completely new entry if none was found.
3103  *
3104  * This function assumes the array has enough space to add a new entry without
3105  * any reallocation of memory.
3106  */
3107
3108 static void add_or_replace_ace(SEC_ACE *nt_ace_list, size_t *num_aces,
3109                                 const DOM_SID *sid, enum security_ace_type type,
3110                                 uint32_t mask, uint8_t flags)
3111 {
3112         int i;
3113
3114         /* first search for a duplicate */
3115         for (i = 0; i < *num_aces; i++) {
3116                 if (sid_equal(&nt_ace_list[i].trustee, sid) &&
3117                     (nt_ace_list[i].flags == flags)) break;
3118         }
3119
3120         if (i < *num_aces) { /* found */
3121                 nt_ace_list[i].type = type;
3122                 nt_ace_list[i].access_mask = mask;
3123                 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3124                            i, sid_string_dbg(sid), flags));
3125                 return;
3126         }
3127
3128         /* not found, append it */
3129         init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3130 }
3131
3132
3133 /****************************************************************************
3134  Reply to query a security descriptor from an fsp. If it succeeds it allocates
3135  the space for the return elements and returns the size needed to return the
3136  security descriptor. This should be the only external function needed for
3137  the UNIX style get ACL.
3138 ****************************************************************************/
3139
3140 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3141                                       const char *name,
3142                                       const SMB_STRUCT_STAT *sbuf,
3143                                       struct pai_val *pal,
3144                                       SMB_ACL_T posix_acl,
3145                                       SMB_ACL_T def_acl,
3146                                       uint32_t security_info,
3147                                       SEC_DESC **ppdesc)
3148 {
3149         DOM_SID owner_sid;
3150         DOM_SID group_sid;
3151         size_t sd_size = 0;
3152         SEC_ACL *psa = NULL;
3153         size_t num_acls = 0;
3154         size_t num_def_acls = 0;
3155         size_t num_aces = 0;
3156         canon_ace *file_ace = NULL;
3157         canon_ace *dir_ace = NULL;
3158         SEC_ACE *nt_ace_list = NULL;
3159         size_t num_profile_acls = 0;
3160         DOM_SID orig_owner_sid;
3161         SEC_DESC *psd = NULL;
3162         int i;
3163
3164         /*
3165          * Get the owner, group and world SIDs.
3166          */
3167
3168         create_file_sids(sbuf, &owner_sid, &group_sid);
3169
3170         if (lp_profile_acls(SNUM(conn))) {
3171                 /* For WXP SP1 the owner must be administrators. */
3172                 sid_copy(&orig_owner_sid, &owner_sid);
3173                 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3174                 sid_copy(&group_sid, &global_sid_Builtin_Users);
3175                 num_profile_acls = 3;
3176         }
3177
3178         if ((security_info & DACL_SECURITY_INFORMATION) && !(security_info & PROTECTED_DACL_SECURITY_INFORMATION)) {
3179
3180                 /*
3181                  * In the optimum case Creator Owner and Creator Group would be used for
3182                  * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3183                  * would lead to usability problems under Windows: The Creator entries
3184                  * are only available in browse lists of directories and not for files;
3185                  * additionally the identity of the owning group couldn't be determined.
3186                  * We therefore use those identities only for Default ACLs.
3187                  */
3188
3189                 /* Create the canon_ace lists. */
3190                 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3191                                             &owner_sid, &group_sid, pal,
3192                                             SMB_ACL_TYPE_ACCESS);
3193
3194                 /* We must have *some* ACLS. */
3195
3196                 if (count_canon_ace_list(file_ace) == 0) {
3197                         DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3198                         goto done;
3199                 }
3200
3201                 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3202                         dir_ace = canonicalise_acl(conn, name, def_acl,
3203                                                    sbuf,
3204                                                    &global_sid_Creator_Owner,
3205                                                    &global_sid_Creator_Group,
3206                                                    pal, SMB_ACL_TYPE_DEFAULT);
3207                 }
3208
3209                 /*
3210                  * Create the NT ACE list from the canonical ace lists.
3211                  */
3212
3213                 {
3214                         canon_ace *ace;
3215                         enum security_ace_type nt_acl_type;
3216
3217                         if (nt4_compatible_acls() && dir_ace) {
3218                                 /*
3219                                  * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3220                                  * but no non-INHERIT_ONLY entry for one SID. So we only
3221                                  * remove entries from the Access ACL if the
3222                                  * corresponding Default ACL entries have also been
3223                                  * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3224                                  * are exceptions. We can do nothing
3225                                  * intelligent if the Default ACL contains entries that
3226                                  * are not also contained in the Access ACL, so this
3227                                  * case will still fail under NT 4.
3228                                  */
3229
3230                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3231                                 if (ace && !ace->perms) {
3232                                         DLIST_REMOVE(dir_ace, ace);
3233                                         SAFE_FREE(ace);
3234
3235                                         ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3236                                         if (ace && !ace->perms) {
3237                                                 DLIST_REMOVE(file_ace, ace);
3238                                                 SAFE_FREE(ace);
3239                                         }
3240                                 }
3241
3242                                 /*
3243                                  * WinNT doesn't usually have Creator Group
3244                                  * in browse lists, so we send this entry to
3245                                  * WinNT even if it contains no relevant
3246                                  * permissions. Once we can add
3247                                  * Creator Group to browse lists we can
3248                                  * re-enable this.
3249                                  */
3250
3251 #if 0
3252                                 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3253                                 if (ace && !ace->perms) {
3254                                         DLIST_REMOVE(dir_ace, ace);
3255                                         SAFE_FREE(ace);
3256                                 }
3257 #endif
3258
3259                                 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3260                                 if (ace && !ace->perms) {
3261                                         DLIST_REMOVE(file_ace, ace);
3262                                         SAFE_FREE(ace);
3263                                 }
3264                         }
3265
3266                         num_acls = count_canon_ace_list(file_ace);
3267                         num_def_acls = count_canon_ace_list(dir_ace);
3268
3269                         /* Allocate the ace list. */
3270                         if ((nt_ace_list = SMB_MALLOC_ARRAY(SEC_ACE,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3271                                 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3272                                 goto done;
3273                         }
3274
3275                         memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(SEC_ACE) );
3276
3277                         /*
3278                          * Create the NT ACE list from the canonical ace lists.
3279                          */
3280
3281                         for (ace = file_ace; ace != NULL; ace = ace->next) {
3282                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3283                                                 &nt_acl_type,
3284                                                 ace->perms,
3285                                                 S_ISDIR(sbuf->st_ex_mode));
3286                                 init_sec_ace(&nt_ace_list[num_aces++],
3287                                         &ace->trustee,
3288                                         nt_acl_type,
3289                                         acc,
3290                                         ace->ace_flags);
3291                         }
3292
3293                         /* The User must have access to a profile share - even
3294                          * if we can't map the SID. */
3295                         if (lp_profile_acls(SNUM(conn))) {
3296                                 add_or_replace_ace(nt_ace_list, &num_aces,
3297                                                    &global_sid_Builtin_Users,
3298                                                    SEC_ACE_TYPE_ACCESS_ALLOWED,
3299                                                    FILE_GENERIC_ALL, 0);
3300                         }
3301
3302                         for (ace = dir_ace; ace != NULL; ace = ace->next) {
3303                                 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3304                                                 &nt_acl_type,
3305                                                 ace->perms,
3306                                                 S_ISDIR(sbuf->st_ex_mode));
3307                                 init_sec_ace(&nt_ace_list[num_aces++],
3308                                         &ace->trustee,
3309                                         nt_acl_type,
3310                                         acc,
3311                                         ace->ace_flags |
3312                                         SEC_ACE_FLAG_OBJECT_INHERIT|
3313                                         SEC_ACE_FLAG_CONTAINER_INHERIT|
3314                                         SEC_ACE_FLAG_INHERIT_ONLY);
3315                         }
3316
3317                         /* The User must have access to a profile share - even
3318                          * if we can't map the SID. */
3319                         if (lp_profile_acls(SNUM(conn))) {
3320                                 add_or_replace_ace(nt_ace_list, &num_aces,
3321                                                 &global_sid_Builtin_Users,
3322                                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3323                                                 FILE_GENERIC_ALL,
3324                                                 SEC_ACE_FLAG_OBJECT_INHERIT |
3325                                                 SEC_ACE_FLAG_CONTAINER_INHERIT |
3326                                                 SEC_ACE_FLAG_INHERIT_ONLY);
3327                         }
3328
3329                         /*
3330                          * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3331                          * Win2K needs this to get the inheritance correct when replacing ACLs
3332                          * on a directory tree. Based on work by Jim @ IBM.
3333                          */
3334
3335                         num_aces = merge_default_aces(nt_ace_list, num_aces);
3336
3337                         if (lp_profile_acls(SNUM(conn))) {
3338                                 for (i = 0; i < num_aces; i++) {
3339                                         if (sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3340                                                 add_or_replace_ace(nt_ace_list, &num_aces,
3341                                                                    &orig_owner_sid,
3342                                                                    nt_ace_list[i].type,
3343                                                                    nt_ace_list[i].access_mask,
3344                                                                    nt_ace_list[i].flags);
3345                                                 break;
3346                                         }
3347                                 }
3348                         }
3349                 }
3350
3351                 if (num_aces) {
3352                         if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3353                                 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3354                                 goto done;
3355                         }
3356                 }
3357         } /* security_info & DACL_SECURITY_INFORMATION */
3358
3359         psd = make_standard_sec_desc( talloc_tos(),
3360                         (security_info & OWNER_SECURITY_INFORMATION) ? &owner_sid : NULL,
3361                         (security_info & GROUP_SECURITY_INFORMATION) ? &group_sid : NULL,
3362                         psa,
3363                         &sd_size);
3364
3365         if(!psd) {
3366                 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3367                 sd_size = 0;
3368                 goto done;
3369         }
3370
3371         /*
3372          * Windows 2000: The DACL_PROTECTED flag in the security
3373          * descriptor marks the ACL as non-inheriting, i.e., no
3374          * ACEs from higher level directories propagate to this
3375          * ACL. In the POSIX ACL model permissions are only
3376          * inherited at file create time, so ACLs never contain
3377          * any ACEs that are inherited dynamically. The DACL_PROTECTED
3378          * flag doesn't seem to bother Windows NT.
3379          * Always set this if map acl inherit is turned off.
3380          */
3381         if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3382                 psd->type |= SEC_DESC_DACL_PROTECTED;
3383         } else {
3384                 psd->type |= pal->sd_type;
3385         }
3386
3387         if (psd->dacl) {
3388                 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3389         }
3390
3391         *ppdesc = psd;
3392
3393  done:
3394
3395         if (posix_acl) {
3396                 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3397         }
3398         if (def_acl) {
3399                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3400         }
3401         free_canon_ace_list(file_ace);
3402         free_canon_ace_list(dir_ace);
3403         free_inherited_info(pal);
3404         SAFE_FREE(nt_ace_list);
3405
3406         return NT_STATUS_OK;
3407 }
3408
3409 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3410                            SEC_DESC **ppdesc)
3411 {
3412         SMB_STRUCT_STAT sbuf;
3413         SMB_ACL_T posix_acl = NULL;
3414         struct pai_val *pal;
3415
3416         *ppdesc = NULL;
3417
3418         DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3419                   fsp_str_dbg(fsp)));
3420
3421         /* can it happen that fsp_name == NULL ? */
3422         if (fsp->is_directory ||  fsp->fh->fd == -1) {
3423                 return posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3424                                         security_info, ppdesc);
3425         }
3426
3427         /* Get the stat struct for the owner info. */
3428         if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3429                 return map_nt_error_from_unix(errno);
3430         }
3431
3432         /* Get the ACL from the fd. */
3433         posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3434
3435         pal = fload_inherited_info(fsp);
3436
3437         return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3438                                        &sbuf, pal, posix_acl, NULL,
3439                                        security_info, ppdesc);
3440 }
3441
3442 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3443                           uint32_t security_info, SEC_DESC **ppdesc)
3444 {
3445         SMB_ACL_T posix_acl = NULL;
3446         SMB_ACL_T def_acl = NULL;
3447         struct pai_val *pal;
3448         struct smb_filename smb_fname;
3449         int ret;
3450
3451         *ppdesc = NULL;
3452
3453         DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3454
3455         ZERO_STRUCT(smb_fname);
3456         smb_fname.base_name = discard_const_p(char, name);
3457
3458         /* Get the stat struct for the owner info. */
3459         if (lp_posix_pathnames()) {
3460                 ret = SMB_VFS_LSTAT(conn, &smb_fname);
3461         } else {
3462                 ret = SMB_VFS_STAT(conn, &smb_fname);
3463         }
3464
3465         if (ret == -1) {
3466                 return map_nt_error_from_unix(errno);
3467         }
3468
3469         /* Get the ACL from the path. */
3470         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3471
3472         /* If it's a directory get the default POSIX ACL. */
3473         if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3474                 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3475                 def_acl = free_empty_sys_acl(conn, def_acl);
3476         }
3477
3478         pal = load_inherited_info(conn, name);
3479
3480         return posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3481                                        posix_acl, def_acl, security_info,
3482                                        ppdesc);
3483 }
3484
3485 /****************************************************************************
3486  Try to chown a file. We will be able to chown it under the following conditions.
3487
3488   1) If we have root privileges, then it will just work.
3489   2) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3490   3) If we have SeRestorePrivilege we can change the user to any other user.
3491   4) If we have write permission to the file and dos_filemodes is set
3492      then allow chown to the currently authenticated user.
3493 ****************************************************************************/
3494
3495 int try_chown(connection_struct *conn, struct smb_filename *smb_fname,
3496               uid_t uid, gid_t gid)
3497 {
3498         int ret;
3499         files_struct *fsp;
3500
3501         if(!CAN_WRITE(conn)) {
3502                 return -1;
3503         }
3504
3505         /* Case (1). */
3506         /* try the direct way first */
3507         if (lp_posix_pathnames()) {
3508                 ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid, gid);
3509         } else {
3510                 ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid, gid);
3511         }
3512
3513         if (ret == 0)
3514                 return 0;
3515
3516         /* Case (2) / (3) */
3517         if (lp_enable_privileges()) {
3518
3519                 bool has_take_ownership_priv = user_has_privileges(current_user.nt_user_token,
3520                                                               &se_take_ownership);
3521                 bool has_restore_priv = user_has_privileges(current_user.nt_user_token,
3522                                                        &se_restore);
3523
3524                 /* Case (2) */
3525                 if ( ( has_take_ownership_priv && ( uid == current_user.ut.uid ) ) ||
3526                 /* Case (3) */
3527                      ( has_restore_priv ) ) {
3528
3529                         become_root();
3530                         /* Keep the current file gid the same - take ownership doesn't imply group change. */
3531                         if (lp_posix_pathnames()) {
3532                                 ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid,
3533                                                     (gid_t)-1);
3534                         } else {
3535                                 ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid,
3536                                                     (gid_t)-1);
3537                         }
3538                         unbecome_root();
3539                         return ret;
3540                 }
3541         }
3542
3543         /* Case (4). */
3544         if (!lp_dos_filemode(SNUM(conn))) {
3545                 errno = EPERM;
3546                 return -1;
3547         }
3548
3549         /* only allow chown to the current user. This is more secure,
3550            and also copes with the case where the SID in a take ownership ACL is
3551            a local SID on the users workstation
3552         */
3553         if (uid != current_user.ut.uid) {
3554                 errno = EPERM;
3555                 return -1;
3556         }
3557
3558         if (lp_posix_pathnames()) {
3559                 ret = SMB_VFS_LSTAT(conn, smb_fname);
3560         } else {
3561                 ret = SMB_VFS_STAT(conn, smb_fname);
3562         }
3563
3564         if (ret == -1) {
3565                 return -1;
3566         }
3567
3568         if (!NT_STATUS_IS_OK(open_file_fchmod(conn, smb_fname, &fsp))) {
3569                 return -1;
3570         }
3571
3572         become_root();
3573         /* Keep the current file gid the same. */
3574         if (fsp->fh->fd == -1) {
3575                 if (lp_posix_pathnames()) {
3576                         ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid,
3577                                             (gid_t)-1);
3578                 } else {
3579                         ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid,
3580                                             (gid_t)-1);
3581                 }
3582         } else {
3583                 ret = SMB_VFS_FCHOWN(fsp, uid, (gid_t)-1);
3584         }
3585         unbecome_root();
3586
3587         close_file(NULL, fsp, NORMAL_CLOSE);
3588
3589         return ret;
3590 }
3591
3592 #if 0
3593 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3594
3595 /****************************************************************************
3596  Take care of parent ACL inheritance.
3597 ****************************************************************************/
3598
3599 NTSTATUS append_parent_acl(files_struct *fsp,
3600                                 const SEC_DESC *pcsd,
3601                                 SEC_DESC **pp_new_sd)
3602 {
3603         struct smb_filename *smb_dname = NULL;
3604         SEC_DESC *parent_sd = NULL;
3605         files_struct *parent_fsp = NULL;
3606         TALLOC_CTX *mem_ctx = talloc_tos();
3607         char *parent_name = NULL;
3608         SEC_ACE *new_ace = NULL;
3609         unsigned int num_aces = pcsd->dacl->num_aces;
3610         NTSTATUS status;
3611         int info;
3612         unsigned int i, j;
3613         SEC_DESC *psd = dup_sec_desc(talloc_tos(), pcsd);
3614         bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3615
3616         if (psd == NULL) {
3617                 return NT_STATUS_NO_MEMORY;
3618         }
3619
3620         if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name,
3621                             NULL)) {
3622                 return NT_STATUS_NO_MEMORY;
3623         }
3624
3625         status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3626                                             &smb_dname);
3627         if (!NT_STATUS_IS_OK(status)) {
3628                 goto fail;
3629         }
3630
3631         status = SMB_VFS_CREATE_FILE(
3632                 fsp->conn,                              /* conn */
3633                 NULL,                                   /* req */
3634                 0,                                      /* root_dir_fid */
3635                 smb_dname,                              /* fname */
3636                 FILE_READ_ATTRIBUTES,                   /* access_mask */
3637                 FILE_SHARE_NONE,                        /* share_access */
3638                 FILE_OPEN,                              /* create_disposition*/
3639                 FILE_DIRECTORY_FILE,                    /* create_options */
3640                 0,                                      /* file_attributes */
3641                 INTERNAL_OPEN_ONLY,                     /* oplock_request */
3642                 0,                                      /* allocation_size */
3643                 NULL,                                   /* sd */
3644                 NULL,                                   /* ea_list */
3645                 &parent_fsp,                            /* result */
3646                 &info);                                 /* pinfo */
3647
3648         if (!NT_STATUS_IS_OK(status)) {
3649                 TALLOC_FREE(smb_dname);
3650                 return status;
3651         }
3652
3653         status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3654                                     DACL_SECURITY_INFORMATION, &parent_sd );
3655
3656         close_file(NULL, parent_fsp, NORMAL_CLOSE);
3657         TALLOC_FREE(smb_dname);
3658
3659         if (!NT_STATUS_IS_OK(status)) {
3660                 return status;
3661         }
3662
3663         /*
3664          * Make room for potentially all the ACLs from
3665          * the parent. We used to add the ugw triple here,
3666          * as we knew we were dealing with POSIX ACLs.
3667          * We no longer need to do so as we can guarentee
3668          * that a default ACL from the parent directory will
3669          * be well formed for POSIX ACLs if it came from a
3670          * POSIX ACL source, and if we're not writing to a
3671          * POSIX ACL sink then we don't care if it's not well
3672          * formed. JRA.
3673          */
3674
3675         num_aces += parent_sd->dacl->num_aces;
3676
3677         if((new_ace = TALLOC_ZERO_ARRAY(mem_ctx, SEC_ACE,
3678                                         num_aces)) == NULL) {
3679                 return NT_STATUS_NO_MEMORY;
3680         }
3681
3682         /* Start by copying in all the given ACE entries. */
3683         for (i = 0; i < psd->dacl->num_aces; i++) {
3684                 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3685         }
3686
3687         /*
3688          * Note that we're ignoring "inherit permissions" here
3689          * as that really only applies to newly created files. JRA.
3690          */
3691
3692         /* Finally append any inherited ACEs. */
3693         for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3694                 SEC_ACE *se = &parent_sd->dacl->aces[j];
3695
3696                 if (fsp->is_directory) {
3697                         if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3698                                 /* Doesn't apply to a directory - ignore. */
3699                                 DEBUG(10,("append_parent_acl: directory %s "
3700                                         "ignoring non container "
3701                                         "inherit flags %u on ACE with sid %s "
3702                                         "from parent %s\n",
3703                                         fsp_str_dbg(fsp),
3704                                         (unsigned int)se->flags,
3705                                         sid_string_dbg(&se->trustee),
3706                                         parent_name));
3707                                 continue;
3708                         }
3709                 } else {
3710                         if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3711                                 /* Doesn't apply to a file - ignore. */
3712                                 DEBUG(10,("append_parent_acl: file %s "
3713                                         "ignoring non object "
3714                                         "inherit flags %u on ACE with sid %s "
3715                                         "from parent %s\n",
3716                                         fsp_str_dbg(fsp),
3717                                         (unsigned int)se->flags,
3718                                         sid_string_dbg(&se->trustee),
3719                                         parent_name));
3720                                 continue;
3721                         }
3722                 }
3723
3724                 if (is_dacl_protected) {
3725                         /* If the DACL is protected it means we must
3726                          * not overwrite an existing ACE entry with the
3727                          * same SID. This is order N^2. Ouch :-(. JRA. */
3728                         unsigned int k;
3729                         for (k = 0; k < psd->dacl->num_aces; k++) {
3730                                 if (sid_equal(&psd->dacl->aces[k].trustee,
3731                                                 &se->trustee)) {
3732                                         break;
3733                                 }
3734                         }
3735                         if (k < psd->dacl->num_aces) {
3736                                 /* SID matched. Ignore. */
3737                                 DEBUG(10,("append_parent_acl: path %s "
3738                                         "ignoring ACE with protected sid %s "
3739                                         "from parent %s\n",
3740                                         fsp_str_dbg(fsp),
3741                                         sid_string_dbg(&se->trustee),
3742                                         parent_name));
3743                                 continue;
3744                         }
3745                 }
3746
3747                 sec_ace_copy(&new_ace[i], se);
3748                 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3749                         new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3750                 }
3751                 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3752
3753                 if (fsp->is_directory) {
3754                         /*
3755                          * Strip off any inherit only. It's applied.
3756                          */
3757                         new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3758                         if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3759                                 /* No further inheritance. */
3760                                 new_ace[i].flags &=
3761                                         ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3762                                         SEC_ACE_FLAG_OBJECT_INHERIT);
3763                         }
3764                 } else {
3765                         /*
3766                          * Strip off any container or inherit
3767                          * flags, they can't apply to objects.
3768                          */
3769                         new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3770                                                 SEC_ACE_FLAG_INHERIT_ONLY|
3771                                                 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3772                 }
3773                 i++;
3774
3775                 DEBUG(10,("append_parent_acl: path %s "
3776                         "inheriting ACE with sid %s "
3777                         "from parent %s\n",
3778                         fsp_str_dbg(fsp),
3779                         sid_string_dbg(&se->trustee),
3780                         parent_name));
3781         }
3782
3783         psd->dacl->aces = new_ace;
3784         psd->dacl->num_aces = i;
3785         psd->type &= ~(SE_DESC_DACL_AUTO_INHERITED|
3786                          SE_DESC_DACL_AUTO_INHERIT_REQ);
3787
3788         *pp_new_sd = psd;
3789         return status;
3790 }
3791 #endif
3792
3793 /****************************************************************************
3794  Reply to set a security descriptor on an fsp. security_info_sent is the
3795  description of the following NT ACL.
3796  This should be the only external function needed for the UNIX style set ACL.
3797 ****************************************************************************/
3798
3799 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const SEC_DESC *psd_orig)
3800 {
3801         connection_struct *conn = fsp->conn;
3802         uid_t user = (uid_t)-1;
3803         gid_t grp = (gid_t)-1;
3804         DOM_SID file_owner_sid;
3805         DOM_SID file_grp_sid;
3806         canon_ace *file_ace_list = NULL;
3807         canon_ace *dir_ace_list = NULL;
3808         bool acl_perms = False;
3809         mode_t orig_mode = (mode_t)0;
3810         NTSTATUS status;
3811         bool set_acl_as_root = false;
3812         bool acl_set_support = false;
3813         bool ret = false;
3814         SEC_DESC *psd = NULL;
3815
3816         DEBUG(10,("set_nt_acl: called for file %s\n",
3817                   fsp_str_dbg(fsp)));
3818
3819         if (!CAN_WRITE(conn)) {
3820                 DEBUG(10,("set acl rejected on read-only share\n"));
3821                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3822         }
3823
3824         if (!psd_orig) {
3825                 return NT_STATUS_INVALID_PARAMETER;
3826         }
3827
3828         psd = dup_sec_desc(talloc_tos(), psd_orig);
3829         if (!psd) {
3830                 return NT_STATUS_NO_MEMORY;
3831         }
3832
3833         /*
3834          * Get the current state of the file.
3835          */
3836
3837         status = vfs_stat_fsp(fsp);
3838         if (!NT_STATUS_IS_OK(status)) {
3839                 return status;
3840         }
3841
3842         /* Save the original element we check against. */
3843         orig_mode = fsp->fsp_name->st.st_ex_mode;
3844
3845         /*
3846          * Unpack the user/group/world id's.
3847          */
3848
3849         /* POSIX can't cope with missing owner/group. */
3850         if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) {
3851                 security_info_sent &= ~SECINFO_OWNER;
3852         }
3853         if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) {
3854                 security_info_sent &= ~SECINFO_GROUP;
3855         }
3856
3857         status = unpack_nt_owners( SNUM(conn), &user, &grp, security_info_sent, psd);
3858         if (!NT_STATUS_IS_OK(status)) {
3859                 return status;
3860         }
3861
3862         /*
3863          * Do we need to chown ? If so this must be done first as the incoming
3864          * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3865          * Noticed by Simo.
3866          */
3867
3868         if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3869             (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3870
3871                 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3872                          fsp_str_dbg(fsp), (unsigned int)user,
3873                          (unsigned int)grp));
3874
3875                 if(try_chown(fsp->conn, fsp->fsp_name, user, grp) == -1) {
3876                         DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3877                                  "= %s.\n", fsp_str_dbg(fsp),
3878                                  (unsigned int)user, (unsigned int)grp,
3879                                  strerror(errno)));
3880                         if (errno == EPERM) {
3881                                 return NT_STATUS_INVALID_OWNER;
3882                         }
3883                         return map_nt_error_from_unix(errno);
3884                 }
3885
3886                 /*
3887                  * Recheck the current state of the file, which may have changed.
3888                  * (suid/sgid bits, for instance)
3889                  */
3890
3891                 status = vfs_stat_fsp(fsp);
3892                 if (!NT_STATUS_IS_OK(status)) {
3893                         return status;
3894                 }
3895
3896                 /* Save the original element we check against. */
3897                 orig_mode = fsp->fsp_name->st.st_ex_mode;
3898
3899                 /* If we successfully chowned, we know we must
3900                  * be able to set the acl, so do it as root.
3901                  */
3902                 set_acl_as_root = true;
3903         }
3904
3905         create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3906
3907         if((security_info_sent & SECINFO_DACL) &&
3908                         (psd->type & SEC_DESC_DACL_PRESENT) &&
3909                         (psd->dacl == NULL)) {
3910                 SEC_ACE ace[3];
3911
3912                 /* We can't have NULL DACL in POSIX.
3913                    Use owner/group/Everyone -> full access. */
3914
3915                 init_sec_ace(&ace[0],
3916                                 &file_owner_sid,
3917                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3918                                 GENERIC_ALL_ACCESS,
3919                                 0);
3920                 init_sec_ace(&ace[1],
3921                                 &file_grp_sid,
3922                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3923                                 GENERIC_ALL_ACCESS,
3924                                 0);
3925                 init_sec_ace(&ace[2],
3926                                 &global_sid_World,
3927                                 SEC_ACE_TYPE_ACCESS_ALLOWED,
3928                                 GENERIC_ALL_ACCESS,
3929                                 0);
3930                 psd->dacl = make_sec_acl(talloc_tos(),
3931                                         NT4_ACL_REVISION,
3932                                         3,
3933                                         ace);
3934                 if (psd->dacl == NULL) {
3935                         return NT_STATUS_NO_MEMORY;
3936                 }
3937                 security_acl_map_generic(psd->dacl, &file_generic_mapping);
3938         }
3939
3940         acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
3941                                      &file_grp_sid, &file_ace_list,
3942                                      &dir_ace_list, security_info_sent, psd);
3943
3944         /* Ignore W2K traverse DACL set. */
3945         if (!file_ace_list && !dir_ace_list) {
3946                 return NT_STATUS_OK;
3947         }
3948
3949         if (!acl_perms) {
3950                 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3951                 free_canon_ace_list(file_ace_list);
3952                 free_canon_ace_list(dir_ace_list);
3953                 return NT_STATUS_ACCESS_DENIED;
3954         }
3955
3956         /*
3957          * Only change security if we got a DACL.
3958          */
3959
3960         if(!(security_info_sent & DACL_SECURITY_INFORMATION) || (psd->dacl == NULL)) {
3961                 free_canon_ace_list(file_ace_list);
3962                 free_canon_ace_list(dir_ace_list);
3963                 return NT_STATUS_OK;
3964         }
3965
3966         /*
3967          * Try using the POSIX ACL set first. Fall back to chmod if
3968          * we have no ACL support on this filesystem.
3969          */
3970
3971         if (acl_perms && file_ace_list) {
3972                 if (set_acl_as_root) {
3973                         become_root();
3974                 }
3975                 ret = set_canon_ace_list(fsp, file_ace_list, false,
3976                                          &fsp->fsp_name->st, &acl_set_support);
3977                 if (set_acl_as_root) {
3978                         unbecome_root();
3979                 }
3980                 if (acl_set_support && ret == false) {
3981                         DEBUG(3,("set_nt_acl: failed to set file acl on file "
3982                                  "%s (%s).\n", fsp_str_dbg(fsp),
3983                                  strerror(errno)));
3984                         free_canon_ace_list(file_ace_list);
3985                         free_canon_ace_list(dir_ace_list);
3986                         return map_nt_error_from_unix(errno);
3987                 }
3988         }
3989
3990         if (acl_perms && acl_set_support && fsp->is_directory) {
3991                 if (dir_ace_list) {
3992                         if (set_acl_as_root) {
3993                                 become_root();
3994                         }
3995                         ret = set_canon_ace_list(fsp, dir_ace_list, true,
3996                                                  &fsp->fsp_name->st,
3997                                                  &acl_set_support);
3998                         if (set_acl_as_root) {
3999                                 unbecome_root();
4000                         }
4001                         if (ret == false) {
4002                                 DEBUG(3,("set_nt_acl: failed to set default "
4003                                          "acl on directory %s (%s).\n",
4004                                          fsp_str_dbg(fsp), strerror(errno)));
4005                                 free_canon_ace_list(file_ace_list);
4006                                 free_canon_ace_list(dir_ace_list);
4007                                 return map_nt_error_from_unix(errno);
4008                         }
4009                 } else {
4010                         int sret = -1;
4011
4012                         /*
4013                          * No default ACL - delete one if it exists.
4014                          */
4015
4016                         if (set_acl_as_root) {
4017                                 become_root();
4018                         }
4019                         sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
4020                             fsp->fsp_name->base_name);
4021                         if (set_acl_as_root) {
4022                                 unbecome_root();
4023                         }
4024                         if (sret == -1) {
4025                                 if (acl_group_override(conn, fsp->fsp_name)) {
4026                                         DEBUG(5,("set_nt_acl: acl group "
4027                                                  "control on and current user "
4028                                                  "in file %s primary group. "
4029                                                  "Override delete_def_acl\n",
4030                                                  fsp_str_dbg(fsp)));
4031
4032                                         become_root();
4033                                         sret =
4034                                             SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
4035                                                     conn,
4036                                                     fsp->fsp_name->base_name);
4037                                         unbecome_root();
4038                                 }
4039
4040                                 if (sret == -1) {
4041                                         DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
4042                                         free_canon_ace_list(file_ace_list);
4043                                         free_canon_ace_list(dir_ace_list);
4044                                         return map_nt_error_from_unix(errno);
4045                                 }
4046                         }
4047                 }
4048         }
4049
4050         if (acl_set_support) {
4051                 if (set_acl_as_root) {
4052                         become_root();
4053                 }
4054                 store_inheritance_attributes(fsp,
4055                                 file_ace_list,
4056                                 dir_ace_list,
4057                                 psd->type);
4058                 if (set_acl_as_root) {
4059                         unbecome_root();
4060                 }
4061         }
4062
4063         /*
4064          * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
4065          */
4066
4067         if(!acl_set_support && acl_perms) {
4068                 mode_t posix_perms;
4069
4070                 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
4071                         free_canon_ace_list(file_ace_list);
4072                         free_canon_ace_list(dir_ace_list);
4073                         DEBUG(3,("set_nt_acl: failed to convert file acl to "
4074                                  "posix permissions for file %s.\n",
4075                                  fsp_str_dbg(fsp)));
4076                         return NT_STATUS_ACCESS_DENIED;
4077                 }
4078
4079                 if (orig_mode != posix_perms) {
4080                         int sret = -1;
4081
4082                         DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
4083                                  fsp_str_dbg(fsp), (unsigned int)posix_perms));
4084
4085                         if (set_acl_as_root) {
4086                                 become_root();
4087                         }
4088                         sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
4089                                              posix_perms);
4090                         if (set_acl_as_root) {
4091                                 unbecome_root();
4092                         }
4093                         if(sret == -1) {
4094                                 if (acl_group_override(conn, fsp->fsp_name)) {
4095                                         DEBUG(5,("set_nt_acl: acl group "
4096                                                  "control on and current user "
4097                                                  "in file %s primary group. "
4098                                                  "Override chmod\n",
4099                                                  fsp_str_dbg(fsp)));
4100
4101                                         become_root();
4102                                         sret = SMB_VFS_CHMOD(conn,
4103                                             fsp->fsp_name->base_name,
4104                                             posix_perms);
4105                                         unbecome_root();
4106                                 }
4107
4108                                 if (sret == -1) {
4109                                         DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4110                                                  "failed. Error = %s.\n",
4111                                                  fsp_str_dbg(fsp),
4112                                                  (unsigned int)posix_perms,
4113                                                  strerror(errno)));
4114                                         free_canon_ace_list(file_ace_list);
4115                                         free_canon_ace_list(dir_ace_list);
4116                                         return map_nt_error_from_unix(errno);
4117                                 }
4118                         }
4119                 }
4120         }
4121
4122         free_canon_ace_list(file_ace_list);
4123         free_canon_ace_list(dir_ace_list);
4124
4125         /* Ensure the stat struct in the fsp is correct. */
4126         status = vfs_stat_fsp(fsp);
4127
4128         return NT_STATUS_OK;
4129 }
4130
4131 /****************************************************************************
4132  Get the actual group bits stored on a file with an ACL. Has no effect if
4133  the file has no ACL. Needed in dosmode code where the stat() will return
4134  the mask bits, not the real group bits, for a file with an ACL.
4135 ****************************************************************************/
4136
4137 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4138 {
4139         int entry_id = SMB_ACL_FIRST_ENTRY;
4140         SMB_ACL_ENTRY_T entry;
4141         SMB_ACL_T posix_acl;
4142         int result = -1;
4143
4144         posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
4145         if (posix_acl == (SMB_ACL_T)NULL)
4146                 return -1;
4147
4148         while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4149                 SMB_ACL_TAG_T tagtype;
4150                 SMB_ACL_PERMSET_T permset;
4151
4152                 entry_id = SMB_ACL_NEXT_ENTRY;
4153
4154                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
4155                         break;
4156
4157                 if (tagtype == SMB_ACL_GROUP_OBJ) {
4158                         if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4159                                 break;
4160                         } else {
4161                                 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4162                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
4163                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4164                                 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4165                                 result = 0;
4166                                 break;
4167                         }
4168                 }
4169         }
4170         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4171         return result;
4172 }
4173
4174 /****************************************************************************
4175  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4176  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4177 ****************************************************************************/
4178
4179 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4180 {
4181         int entry_id = SMB_ACL_FIRST_ENTRY;
4182         SMB_ACL_ENTRY_T entry;
4183         int num_entries = 0;
4184
4185         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4186                 SMB_ACL_TAG_T tagtype;
4187                 SMB_ACL_PERMSET_T permset;
4188                 mode_t perms;
4189
4190                 entry_id = SMB_ACL_NEXT_ENTRY;
4191
4192                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
4193                         return -1;
4194
4195                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
4196                         return -1;
4197
4198                 num_entries++;
4199
4200                 switch(tagtype) {
4201                         case SMB_ACL_USER_OBJ:
4202                                 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4203                                 break;
4204                         case SMB_ACL_GROUP_OBJ:
4205                                 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4206                                 break;
4207                         case SMB_ACL_MASK:
4208                                 /*
4209                                  * FIXME: The ACL_MASK entry permissions should really be set to
4210                                  * the union of the permissions of all ACL_USER,
4211                                  * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4212                                  * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4213                                  */
4214                                 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4215                                 break;
4216                         case SMB_ACL_OTHER:
4217                                 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4218                                 break;
4219                         default:
4220                                 continue;
4221                 }
4222
4223                 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4224                         return -1;
4225
4226                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
4227                         return -1;
4228         }
4229
4230         /*
4231          * If this is a simple 3 element ACL or no elements then it's a standard
4232          * UNIX permission set. Just use chmod...
4233          */
4234
4235         if ((num_entries == 3) || (num_entries == 0))
4236                 return -1;
4237
4238         return 0;
4239 }
4240
4241 /****************************************************************************
4242  Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4243  GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4244  resulting ACL on TO.  Note that name is in UNIX character set.
4245 ****************************************************************************/
4246
4247 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4248 {
4249         SMB_ACL_T posix_acl = NULL;
4250         int ret = -1;
4251
4252         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4253                 return -1;
4254
4255         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4256                 goto done;
4257
4258         ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4259
4260  done:
4261
4262         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4263         return ret;
4264 }
4265
4266 /****************************************************************************
4267  Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4268  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4269  Note that name is in UNIX character set.
4270 ****************************************************************************/
4271
4272 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4273 {
4274         return copy_access_posix_acl(conn, name, name, mode);
4275 }
4276
4277 /****************************************************************************
4278  Check for an existing default POSIX ACL on a directory.
4279 ****************************************************************************/
4280
4281 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4282 {
4283         SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4284         bool has_acl = False;
4285         SMB_ACL_ENTRY_T entry;
4286
4287         if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4288                 has_acl = True;
4289         }
4290
4291         if (def_acl) {
4292                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4293         }
4294         return has_acl;
4295 }
4296
4297 /****************************************************************************
4298  If the parent directory has no default ACL but it does have an Access ACL,
4299  inherit this Access ACL to file name.
4300 ****************************************************************************/
4301
4302 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4303                        const char *name, mode_t mode)
4304 {
4305         if (directory_has_default_posix_acl(conn, inherit_from_dir))
4306                 return 0;
4307
4308         return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4309 }
4310
4311 /****************************************************************************
4312  Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4313  and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4314 ****************************************************************************/
4315
4316 int fchmod_acl(files_struct *fsp, mode_t mode)
4317 {
4318         connection_struct *conn = fsp->conn;
4319         SMB_ACL_T posix_acl = NULL;
4320         int ret = -1;
4321
4322         if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4323                 return -1;
4324
4325         if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4326                 goto done;
4327
4328         ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4329
4330   done:
4331
4332         SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4333         return ret;
4334 }
4335
4336 /****************************************************************************
4337  Map from wire type to permset.
4338 ****************************************************************************/
4339
4340 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4341 {
4342         if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4343                 return False;
4344         }
4345
4346         if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) ==  -1) {
4347                 return False;
4348         }
4349
4350         if (wire_perm & SMB_POSIX_ACL_READ) {
4351                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
4352                         return False;
4353                 }
4354         }
4355         if (wire_perm & SMB_POSIX_ACL_WRITE) {
4356                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
4357                         return False;
4358                 }
4359         }
4360         if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4361                 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
4362                         return False;
4363                 }
4364         }
4365         return True;
4366 }
4367
4368 /****************************************************************************
4369  Map from wire type to tagtype.
4370 ****************************************************************************/
4371
4372 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4373 {
4374         switch (wire_tt) {
4375                 case SMB_POSIX_ACL_USER_OBJ:
4376                         *p_tt = SMB_ACL_USER_OBJ;
4377                         break;
4378                 case SMB_POSIX_ACL_USER:
4379                         *p_tt = SMB_ACL_USER;
4380                         break;
4381                 case SMB_POSIX_ACL_GROUP_OBJ:
4382                         *p_tt = SMB_ACL_GROUP_OBJ;
4383                         break;
4384                 case SMB_POSIX_ACL_GROUP:
4385                         *p_tt = SMB_ACL_GROUP;
4386                         break;
4387                 case SMB_POSIX_ACL_MASK:
4388                         *p_tt = SMB_ACL_MASK;
4389                         break;
4390                 case SMB_POSIX_ACL_OTHER:
4391                         *p_tt = SMB_ACL_OTHER;
4392                         break;
4393                 default:
4394                         return False;
4395         }
4396         return True;
4397 }
4398
4399 /****************************************************************************
4400  Create a new POSIX acl from wire permissions.
4401  FIXME ! How does the share mask/mode fit into this.... ?
4402 ****************************************************************************/
4403
4404 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4405 {
4406         unsigned int i;
4407         SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4408
4409         if (the_acl == NULL) {
4410                 return NULL;
4411         }
4412
4413         for (i = 0; i < num_acls; i++) {
4414                 SMB_ACL_ENTRY_T the_entry;
4415                 SMB_ACL_PERMSET_T the_permset;
4416                 SMB_ACL_TAG_T tag_type;
4417
4418                 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4419                         DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4420                                 i, strerror(errno) ));
4421                         goto fail;
4422                 }
4423
4424                 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4425                         DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4426                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4427                         goto fail;
4428                 }
4429
4430                 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4431                         DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4432                                 i, strerror(errno) ));
4433                         goto fail;
4434                 }
4435
4436                 /* Get the permset pointer from the new ACL entry. */
4437                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4438                         DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4439                                 i, strerror(errno) ));
4440                         goto fail;
4441                 }
4442
4443                 /* Map from wire to permissions. */
4444                 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4445                         DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4446                                 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4447                         goto fail;
4448                 }
4449
4450                 /* Now apply to the new ACL entry. */
4451                 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4452                         DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4453                                 i, strerror(errno) ));
4454                         goto fail;
4455                 }
4456
4457                 if (tag_type == SMB_ACL_USER) {
4458                         uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4459                         uid_t uid = (uid_t)uidval;
4460                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4461                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4462                                         (unsigned int)uid, i, strerror(errno) ));
4463                                 goto fail;
4464                         }
4465                 }
4466
4467                 if (tag_type == SMB_ACL_GROUP) {
4468                         uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4469                         gid_t gid = (uid_t)gidval;
4470                         if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4471                                 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4472                                         (unsigned int)gid, i, strerror(errno) ));
4473                                 goto fail;
4474                         }
4475                 }
4476         }
4477
4478         return the_acl;
4479
4480  fail:
4481
4482         if (the_acl != NULL) {
4483                 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4484         }
4485         return NULL;
4486 }
4487
4488 /****************************************************************************
4489  Calls from UNIX extensions - Default POSIX ACL set.
4490  If num_def_acls == 0 and not a directory just return. If it is a directory
4491  and num_def_acls == 0 then remove the default acl. Else set the default acl
4492  on the directory.
4493 ****************************************************************************/
4494
4495 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4496                                 uint16 num_def_acls, const char *pdata)
4497 {
4498         SMB_ACL_T def_acl = NULL;
4499
4500         if (!S_ISDIR(psbuf->st_ex_mode)) {
4501                 if (num_def_acls) {
4502                         DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4503                         errno = EISDIR;
4504                         return False;
4505                 } else {
4506                         return True;
4507                 }
4508         }
4509
4510         if (!num_def_acls) {
4511                 /* Remove the default ACL. */
4512                 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4513                         DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4514                                 fname, strerror(errno) ));
4515                         return False;
4516                 }
4517                 return True;
4518         }
4519
4520         if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4521                 return False;
4522         }
4523
4524         if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4525                 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4526                         fname, strerror(errno) ));
4527                 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4528                 return False;
4529         }
4530
4531         DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4532         SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4533         return True;
4534 }
4535
4536 /****************************************************************************
4537  Remove an ACL from a file. As we don't have acl_delete_entry() available
4538  we must read the current acl and copy all entries except MASK, USER and GROUP
4539  to a new acl, then set that. This (at least on Linux) causes any ACL to be
4540  removed.
4541  FIXME ! How does the share mask/mode fit into this.... ?
4542 ****************************************************************************/
4543
4544 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4545 {
4546         SMB_ACL_T file_acl = NULL;
4547         int entry_id = SMB_ACL_FIRST_ENTRY;
4548         SMB_ACL_ENTRY_T entry;
4549         bool ret = False;
4550         /* Create a new ACL with only 3 entries, u/g/w. */
4551         SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4552         SMB_ACL_ENTRY_T user_ent = NULL;
4553         SMB_ACL_ENTRY_T group_ent = NULL;
4554         SMB_ACL_ENTRY_T other_ent = NULL;
4555
4556         if (new_file_acl == NULL) {
4557                 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4558                 return False;
4559         }
4560
4561         /* Now create the u/g/w entries. */
4562         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4563                 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4564                         fname, strerror(errno) ));
4565                 goto done;
4566         }
4567         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4568                 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4569                         fname, strerror(errno) ));
4570                 goto done;
4571         }
4572
4573         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4574                 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4575                         fname, strerror(errno) ));
4576                 goto done;
4577         }
4578         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4579                 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4580                         fname, strerror(errno) ));
4581                 goto done;
4582         }
4583
4584         if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4585                 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4586                         fname, strerror(errno) ));
4587                 goto done;
4588         }
4589         if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4590                 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4591                         fname, strerror(errno) ));
4592                 goto done;
4593         }
4594
4595         /* Get the current file ACL. */
4596         if (fsp && fsp->fh->fd != -1) {
4597                 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4598         } else {
4599                 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4600         }
4601
4602         if (file_acl == NULL) {
4603                 /* This is only returned if an error occurred. Even for a file with
4604                    no acl a u/g/w acl should be returned. */
4605                 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4606                         fname, strerror(errno) ));
4607                 goto done;
4608         }
4609
4610         while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4611                 SMB_ACL_TAG_T tagtype;
4612                 SMB_ACL_PERMSET_T permset;
4613
4614                 entry_id = SMB_ACL_NEXT_ENTRY;
4615
4616                 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4617                         DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4618                                 fname, strerror(errno) ));
4619                         goto done;
4620                 }
4621
4622                 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4623                         DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4624                                 fname, strerror(errno) ));
4625                         goto done;
4626                 }
4627
4628                 if (tagtype == SMB_ACL_USER_OBJ) {
4629                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4630                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4631                                         fname, strerror(errno) ));
4632                         }
4633                 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4634                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4635                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4636                                         fname, strerror(errno) ));
4637                         }
4638                 } else if (tagtype == SMB_ACL_OTHER) {
4639                         if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4640                                 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4641                                         fname, strerror(errno) ));
4642                         }
4643                 }
4644         }
4645
4646         /* Set the new empty file ACL. */
4647         if (fsp && fsp->fh->fd != -1) {
4648                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4649                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4650                                 fname, strerror(errno) ));
4651                         goto done;
4652                 }
4653         } else {
4654                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4655                         DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4656                                 fname, strerror(errno) ));
4657                         goto done;
4658                 }
4659         }
4660
4661         ret = True;
4662
4663  done:
4664
4665         if (file_acl) {
4666                 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4667         }
4668         if (new_file_acl) {
4669                 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4670         }
4671         return ret;
4672 }
4673
4674 /****************************************************************************
4675  Calls from UNIX extensions - POSIX ACL set.
4676  If num_def_acls == 0 then read/modify/write acl after removing all entries
4677  except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4678 ****************************************************************************/
4679
4680 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4681 {
4682         SMB_ACL_T file_acl = NULL;
4683
4684         if (!num_acls) {
4685                 /* Remove the ACL from the file. */
4686                 return remove_posix_acl(conn, fsp, fname);
4687         }
4688
4689         if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4690                 return False;
4691         }
4692
4693         if (fsp && fsp->fh->fd != -1) {
4694                 /* The preferred way - use an open fd. */
4695                 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4696                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4697                                 fname, strerror(errno) ));
4698                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4699                         return False;
4700                 }
4701         } else {
4702                 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4703                         DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4704                                 fname, strerror(errno) ));
4705                         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4706                         return False;
4707                 }
4708         }
4709
4710         DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4711         SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4712         return True;
4713 }
4714
4715 /********************************************************************
4716  Pull the NT ACL from a file on disk or the OpenEventlog() access
4717  check.  Caller is responsible for freeing the returned security
4718  descriptor via TALLOC_FREE().  This is designed for dealing with
4719  user space access checks in smbd outside of the VFS.  For example,
4720  checking access rights in OpenEventlog().
4721
4722  Assume we are dealing with files (for now)
4723 ********************************************************************/
4724
4725 SEC_DESC *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4726 {
4727         SEC_DESC *psd, *ret_sd;
4728         connection_struct *conn;
4729         files_struct finfo;
4730         struct fd_handle fh;
4731         NTSTATUS status;
4732
4733         conn = TALLOC_ZERO_P(ctx, connection_struct);
4734         if (conn == NULL) {
4735                 DEBUG(0, ("talloc failed\n"));
4736                 return NULL;
4737         }
4738
4739         if (!(conn->params = TALLOC_P(conn, struct share_params))) {
4740                 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4741                 TALLOC_FREE(conn);
4742                 return NULL;
4743         }
4744
4745         conn->params->service = -1;
4746
4747         set_conn_connectpath(conn, "/");
4748
4749         if (!smbd_vfs_init(conn)) {
4750                 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4751                 conn_free(conn);
4752                 return NULL;
4753         }
4754
4755         ZERO_STRUCT( finfo );
4756         ZERO_STRUCT( fh );
4757
4758         finfo.fnum = -1;
4759         finfo.conn = conn;
4760         finfo.fh = &fh;
4761         finfo.fh->fd = -1;
4762
4763         status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
4764                                             &finfo.fsp_name);
4765         if (!NT_STATUS_IS_OK(status)) {
4766                 conn_free(conn);
4767                 return NULL;
4768         }
4769
4770         if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, DACL_SECURITY_INFORMATION, &psd))) {
4771                 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4772                 TALLOC_FREE(finfo.fsp_name);
4773                 conn_free(conn);
4774                 return NULL;
4775         }
4776
4777         ret_sd = dup_sec_desc( ctx, psd );
4778
4779         TALLOC_FREE(finfo.fsp_name);
4780         conn_free(conn);
4781
4782         return ret_sd;
4783 }
4784
4785 /* Stolen shamelessly from pvfs_default_acl() in source4 :-). */
4786
4787 NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx,
4788                                         const char *name,
4789                                         SMB_STRUCT_STAT *psbuf,
4790                                         SEC_DESC **ppdesc)
4791 {
4792         struct dom_sid owner_sid, group_sid;
4793         size_t size = 0;
4794         SEC_ACE aces[4];
4795         uint32_t access_mask = 0;
4796         mode_t mode = psbuf->st_ex_mode;
4797         SEC_ACL *new_dacl = NULL;
4798         int idx = 0;
4799
4800         DEBUG(10,("make_default_filesystem_acl: file %s mode = 0%o\n",
4801                 name, (int)mode ));
4802
4803         uid_to_sid(&owner_sid, psbuf->st_ex_uid);
4804         gid_to_sid(&group_sid, psbuf->st_ex_gid);
4805
4806         /*
4807          We provide up to 4 ACEs
4808                 - Owner
4809                 - Group
4810                 - Everyone
4811                 - NT System
4812         */
4813
4814         if (mode & S_IRUSR) {
4815                 if (mode & S_IWUSR) {
4816                         access_mask |= SEC_RIGHTS_FILE_ALL;
4817                 } else {
4818                         access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4819                 }
4820         }
4821         if (mode & S_IWUSR) {
4822                 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
4823         }
4824
4825         init_sec_ace(&aces[idx],
4826                         &owner_sid,
4827                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4828                         access_mask,
4829                         0);
4830         idx++;
4831
4832         access_mask = 0;
4833         if (mode & S_IRGRP) {
4834                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4835         }
4836         if (mode & S_IWGRP) {
4837                 /* note that delete is not granted - this matches posix behaviour */
4838                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4839         }
4840         if (access_mask) {
4841                 init_sec_ace(&aces[idx],
4842                         &group_sid,
4843                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4844                         access_mask,
4845                         0);
4846                 idx++;
4847         }
4848
4849         access_mask = 0;
4850         if (mode & S_IROTH) {
4851                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4852         }
4853         if (mode & S_IWOTH) {
4854                 access_mask |= SEC_RIGHTS_FILE_WRITE;
4855         }
4856         if (access_mask) {
4857                 init_sec_ace(&aces[idx],
4858                         &global_sid_World,
4859                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4860                         access_mask,
4861                         0);
4862                 idx++;
4863         }
4864
4865         init_sec_ace(&aces[idx],
4866                         &global_sid_System,
4867                         SEC_ACE_TYPE_ACCESS_ALLOWED,
4868                         SEC_RIGHTS_FILE_ALL,
4869                         0);
4870         idx++;
4871
4872         new_dacl = make_sec_acl(ctx,
4873                         NT4_ACL_REVISION,
4874                         idx,
4875                         aces);
4876
4877         if (!new_dacl) {
4878                 return NT_STATUS_NO_MEMORY;
4879         }
4880
4881         *ppdesc = make_sec_desc(ctx,
4882                         SECURITY_DESCRIPTOR_REVISION_1,
4883                         SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
4884                         &owner_sid,
4885                         &group_sid,
4886                         NULL,
4887                         new_dacl,
4888                         &size);
4889         if (!*ppdesc) {
4890                 return NT_STATUS_NO_MEMORY;
4891         }
4892         return NT_STATUS_OK;
4893 }